74HCT4538PW,112 [NXP]
74HC(T)4538 - Dual retriggerable precision monostable multivibrator TSSOP 16-Pin;
| 型号： | 74HCT4538PW,112 |
| 厂家： | 
NXP |
| 描述： | 74HC(T)4538 - Dual retriggerable precision monostable multivibrator TSSOP 16-Pin |
| 文件： | 总24页 (文件大小：136K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
74HC4538; 74HCT4538
Dual retriggerable precision monostable multivibrator
Rev. 03 — 8 June 2009
Product data sheet
1. General description
The 74HC4538; 74HCT4538 are high-speed Si-gate CMOS devices and are pin
compatible with Low-power Schottky TTL (LSTTL). They are specified in compliance with
JEDEC standard no. 7A.
The 74HC4538; 74HCT4538 are dual retriggerable-resettable monostable multivibrators.
Each multivibrator has an active LOW trigger/retrigger input (nA), an active HIGH
trigger/retrigger input (nB), an overriding active LOW direct reset input (nCD), an output
(nQ) and its complement (nQ), and two pins (nREXT/CEXT and nCEXT) for connecting
the external timing components CEXT and REXT. Typical pulse width variation over the
specified temperature range is ±0.2 %.
The multivibrator may be triggered by either the positive or the negative edges of the input
pulse. The duration and accuracy of the output pulse are determined by the external
timing components CEXT and REXT. The output pulse width (tW) is equal to
0.7 × REXT × CEXT. The linear design techniques guarantee precise control of the output
pulse width. A LOW level at nCD terminates the output pulse immediately. Schmitt trigger
action on pins nA and nB makes the circuit highly tolerant of slower rise and fall times.
2. Features
I Tolerant of slow trigger rise and fall times
I Separate reset inputs
I Triggering from falling or rising edge
I Multiple package options
I ESD protection:
N HBM JESD22-A114E exceeds 2000 V
N MM JESD22-A115-A exceeds 200 V
I Specified from −40 °C to +85 °C and from −40 °C to +125 °C
74HC4538; 74HCT4538
NXP Semiconductors
Dual retriggerable precision monostable multivibrator
3. Ordering information
Table 1.
Ordering information
Type number
Package
Temperature range Name
Description
plastic dual in-line package; 16-leads (300 mil)
Version
74HC4538N
74HCT4538N
74HC4538D
74HCT4538D
74HC4538DB
74HCT4538DB
−40 °C to +125 °C
−40 °C to +125 °C
−40 °C to +125 °C
DIP16
SOT38-4
SO16
plastic small outline package; 16 leads; body width 3.9 mm SOT109-1
SSOP16 plastic shrink small outline package; 16 leads;
body width 5.3 mm
SOT338-1
SOT403-1
74HC4538PW −40 °C to +125 °C
TSSOP16 plastic thin shrink small outline package; 16 leads;
body width 4.4 mm
74HCT4538PW
4. Functional diagram
2
1
1REXT/CEXT
1CEXT
1Q
1Q
6
7
5
4
1A
1B
3
1CD
2REXT/CEXT
2CEXT
14
15
2Q 10
11 2A
12 2B
2Q
9
13 2CD
001aae727
Fig 1. Functional diagram
74HC_HCT4538_3
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 03 — 8 June 2009
2 of 24
74HC4538; 74HCT4538
NXP Semiconductors
Dual retriggerable precision monostable multivibrator
nB
nA
V
CC
nREXT/CEXT
nCEXT
enable
V
ref1
GND
nCD
power-on reset
V
ref2
V
CC
enable
nQ
nQ
mba338
GND
Fig 2. Logic diagram (one multivibrator)
74HC_HCT4538_3
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 03 — 8 June 2009
3 of 24
74HC4538; 74HCT4538
NXP Semiconductors
Dual retriggerable precision monostable multivibrator
5. Pinning information
5.1 Pinning
74HC4538
74HCT4538
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
1CEXT
V
CC
74HC4538
74HCT4538
1REXT/CEXT
2CEXT
1CD
1B
2REXT/CEXT
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
1CEXT
V
CC
1REXT/CEXT
2CEXT
2CD
2B
1CD
1B
2REXT/CEXT
1A
2CD
2B
1A
1Q
2A
1Q
2A
1Q
2Q
2Q
1Q
2Q
2Q
GND
GND
001aak190
001aak191
Fig 3. Pin configuration for DIP16 and SO16
Fig 4. Pin configuration for SSOP16 and TSSOP16
5.2 Pin description
Table 2.
Symbol
Pin description
Pin
Description
1CEXT, 2CEXT
1, 15
2, 14
3, 13
4, 12
5, 11
6, 10
7, 9
8
external capacitor connection (always connected to ground)
external capacitor/resistor connection
direct reset input (active LOW)
input (LOW to HIGH triggered)
input (HIGH to LOW triggered)
output
1REXT/CEXT, 2REXT/CEXT
1CD, 2CD
1B, 2B
1A, 2A
1Q, 2Q
1Q, 2Q
GND
complementary output (active LOW)
ground (0 V)
VCC
16
supply voltage
74HC_HCT4538_3
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 03 — 8 June 2009
4 of 24
74HC4538; 74HCT4538
NXP Semiconductors
Dual retriggerable precision monostable multivibrator
6. Functional description
Table 3.
Inputs
nA
Function table
Outputs
nB
nCD
nQ
nQ
↓
L
H
H
X
↑
H
L
X
L
H
[1] H = HIGH voltage level; L = LOW voltage level; X = don’t care;
↑ = positive-going transition; ↓ = negative-going transition;
= one HIGH level output pulse, with the pule width determined by CEXT and REXT
;
= one LOW level output pulse, with the pulse width determined by CEXT and REXT
.
(1)
(1)
(2)
(1)
nB input
nA input
(3)
(4)
nCD input
nREXT/CEXT input
V
ref2
V
ref2
V
V
ref1
ref1
nQ output
T
(5)
T
T
001aae737
(1) Positive edge triggering.
(2) Positive edge re-triggering (pulse lengthening).
(3) Negative edge triggering.
(4) Reset (pulse shortening).
(5) T = 0.7 × REXT × CEXT (see also Figure 6).
Fig 5. Timing diagram
74HC_HCT4538_3
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 03 — 8 June 2009
5 of 24
74HC4538; 74HCT4538
NXP Semiconductors
Dual retriggerable precision monostable multivibrator
C
EXT
R
EXT
V
CC
GND
nCEXT
nREXT/CEXT
nQ
T
nA
nB
nQ
T = 0.7 × R
× C
EXT
EXT
nCD
001aak192
Fig 6. Connection of the external timing components REXT and CEXT
7. Limiting values
Table 4.
Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to GND (ground = 0 V).
Symbol Parameter
Conditions
Min
Max
+7.0
±20
±20
±25
+50
-
Unit
V
VCC
IIK
supply voltage
−0.5
[1]
[1]
input clamping current
output clamping current
output current
VI < −0.5 V or VI > VCC + 0.5 V
VO < −0.5 V or VO > VCC + 0.5 V
VO = −0.5 V to VCC + 0.5 V
-
mA
mA
mA
mA
mA
°C
IOK
IO
-
-
ICC
IGND
Tstg
Ptot
supply current
-
ground current
−50
−65
storage temperature
total power dissipation
+150
Tamb = −40 °C to +125 °C
DIP16 package
[2]
[3]
[4]
-
-
-
750
500
500
mW
mW
mW
SO16 package
(T)SSOP16 package
[1] The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
[2] Ptot derates linearly with 12 mW/K above 70 °C.
[3] Ptot derates linearly with 8 mW/K above 70 °C.
[4] Ptot derates linearly with 5.5 mW/K above 60 °C.
74HC_HCT4538_3
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 03 — 8 June 2009
6 of 24
74HC4538; 74HCT4538
NXP Semiconductors
Dual retriggerable precision monostable multivibrator
8. Recommended operating conditions
Table 5.
Recommended operating conditions
Voltages are referenced to GND (ground = 0 V)
Symbol Parameter Conditions
74HC4538
74HCT4538
Unit
Min
Typ
Max
6.0
Min
Typ
Max
5.5
VCC
VI
supply voltage
2.0
5.0
4.5
5.0
V
V
V
input voltage
0
-
VCC
VCC
+125
625
139
83
0
-
VCC
VCC
VO
output voltage
0
-
0
-
Tamb
∆t/∆V
ambient temperature
input transition rise and fall rate VCC = 2.0 V
VCC = 4.5 V
−40
-
−40
-
+125 °C
-
-
-
-
1.67
-
-
-
-
-
1.67
-
-
ns/V
139 ns/V
VCC = 6.0 V
-
ns/V
9. Static characteristics
Table 6.
Static characteristics
At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
Symbol Parameter
Conditions
25 °C
−40 °C to +85 °C −40 °C to +125 °C Unit
Min Typ Max
Min
Max
Min
Max
74HC4538
VIH
HIGH-level
input voltage
VCC = 2.0 V
1.5
1.2
-
-
1.5
-
-
1.5
-
-
V
V
V
V
V
V
VCC = 4.5 V
3.15 2.4
3.15
3.15
VCC = 6.0 V
4.2
3.2
0.8
-
4.2
-
4.2
-
VIL
LOW-level
input voltage
VCC = 2.0 V
-
-
-
0.5
-
-
-
0.5
1.35
1.8
-
-
-
0.5
1.35
1.8
VCC = 4.5 V
2.1 1.35
VCC = 6.0 V
2.8
1.8
VOH
HIGH-level
VI = VIH or VIL
output voltage
IO = −20 µA; VCC = 2.0 V
IO = −20 µA; VCC = 4.5 V
IO = −20 µA; VCC = 6.0 V
1.9
4.4
5.9
2.0
4.5
6.0
-
-
-
-
-
1.9
4.4
-
-
-
-
-
1.9
4.4
5.9
3.7
5.2
-
-
-
-
-
V
V
V
V
V
5.9
IO = −4.0 mA; VCC = 4.5 V 3.98 4.32
IO = −5.2 mA; VCC = 6.0 V 5.48 5.81
VI = VIH or VIL
3.84
5.34
VOL
LOW-level
output voltage
IO = 20 µA; VCC = 2.0 V
IO = 20 µA; VCC = 4.5 V
IO = 20 µA; VCC = 6.0 V
IO = 4.0 mA; VCC = 4.5 V
IO = 5.2 mA; VCC = 6.0 V
VI = VCC or GND;
-
-
-
-
-
-
0
0
0
0.1
0.1
0.1
-
-
-
-
-
-
0.1
0.1
-
-
-
-
-
-
0.1
0.1
0.1
0.4
0.4
±1
V
V
0.1
V
0.15 0.26
0.16 0.26
0.33
0.33
±1
V
V
II
input leakage
current
-
±0.1
µA
V
CC = 6.0 V
pin nREXT/CEXT;
-
-
±0.5
-
±5
-
±10
µA
VI = 2.0 V or GND; other
inputs at VCC or GND;
V
CC = 6.0 V [1]
74HC_HCT4538_3
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 03 — 8 June 2009
7 of 24
74HC4538; 74HCT4538
NXP Semiconductors
Dual retriggerable precision monostable multivibrator
Table 6.
Static characteristics …continued
At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
Symbol Parameter
Conditions
25 °C
−40 °C to +85 °C −40 °C to +125 °C Unit
Min Typ Max
Min
Max
Min
Max
ICC
CI
supply current VI = VCC or GND; IO = 0 A;
CC = 6.0 V
-
-
8.0
-
80
-
160
µA
V
input
-
3.5
-
-
-
-
-
pF
capacitance
74HCT4538
VIH
HIGH-level
input voltage
VCC = 4.5 V to 5.5 V
VCC = 4.5 V to 5.5 V
2.0
-
1.6
1.2
-
2.0
-
-
2.0
-
-
V
V
VIL
LOW-level
0.8
0.8
0.8
input voltage
VOH
HIGH-level
output voltage
VI = VIH or VIL; VCC = 4.5 V
IO = −20 µA
4.4
4.5
-
-
4.4
-
-
4.4
3.7
-
-
V
V
IO = −4.0 mA
3.98 4.32
3.84
VOL
LOW-level
output voltage
VI = VIH or VIL; VCC = 4.5 V
IO = 20 µA; VCC = 4.5 V
IO = 4.0 mA; VCC = 4.5 V
VI = VCC or GND;
-
-
-
0
0.1
-
-
-
0.1
0.33
±1
-
-
-
0.1
0.4
±1
V
0.15 0.26
V
II
input leakage
current
-
±0.1
µA
V
CC = 5.5 V
pin nREXT/CEXT;
-
-
±0.5
-
±5
-
±10
µA
µA
VI = 2.0 V or GND; other
inputs at VCC or GND;
V
CC = 5.5 V [1]
ICC
supply current VI = VCC or GND; IO = 0 A;
CC = 5.5 V
-
-
8.0
-
80
-
160
V
∆ICC
additional
VI = VCC − 2.1 V; IO = 0 A;
supply current other inputs at VCC or GND;
V
CC = 4.5 V to 5.5 V
pin nA, nB
-
-
-
50
65
180
234
-
-
-
-
225
293
-
-
-
-
245
319
-
µA
µA
pF
pin nCD
CI
input
3.5
capacitance
[1] This measurement can only be carried out after a trigger pulse is applied.
74HC_HCT4538_3
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 03 — 8 June 2009
8 of 24
74HC4538; 74HCT4538
NXP Semiconductors
Dual retriggerable precision monostable multivibrator
10. Dynamic characteristics
Table 7.
Dynamic characteristics
Voltages are referenced to GND (ground = 0 V); for test circuit see Figure 9.
Symbol Parameter
Conditions
25 °C
−40 °C to
+85 °C
−40 °C to
+125 °C
Unit
Min
Typ[1]
Max
Min
Max
Min
Max
74HC4538
tPLH
tPHL
tt
LOW to HIGH nA, nB to nQ;
propagation
delay
see Figure 7
VCC = 2.0 V
-
-
-
-
85
31
27
25
265
53
-
-
-
-
-
330
66
-
-
-
-
-
400 ns
VCC = 4.5 V
80
-
ns
ns
ns
VCC = 5.0 V; CL = 15 pF
VCC = 6.0 V
45
56
68
nCD to nQ; see Figure 7
VCC = 2.0 V
-
-
-
83
30
24
265
53
-
-
-
340
68
-
-
-
400 ns
VCC = 4.5 V
80
68
ns
ns
VCC = 6.0 V
45
58
HIGH to LOW nA, nB to nQ;
propagation
delay
see Figure 7
VCC = 2.0 V
-
-
-
-
83
30
27
24
265
53
-
-
-
-
-
330
66
-
-
-
-
-
400 ns
VCC = 4.5 V
80
-
ns
ns
ns
VCC = 5.0 V; CL = 15 pF
VCC = 6.0 V
45
56
68
nCD to nQ; see Figure 7
VCC = 2.0 V
-
-
-
80
29
23
265
53
-
-
-
330
66
-
-
-
400 ns
VCC = 4.5 V
80
68
ns
ns
VCC = 6.0 V
45
56
[2]
transition time nQ and nQ; see Figure 7
VCC = 2.0 V
VCC = 4.5 V
VCC = 6.0 V
-
-
-
19
7
75
15
13
-
-
-
95
19
16
-
-
-
119 ns
22
19
ns
ns
6
74HC_HCT4538_3
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 03 — 8 June 2009
9 of 24
74HC4538; 74HCT4538
NXP Semiconductors
Dual retriggerable precision monostable multivibrator
Table 7.
Dynamic characteristics …continued
Voltages are referenced to GND (ground = 0 V); for test circuit see Figure 9.
Symbol Parameter
Conditions
25 °C
−40 °C to
+85 °C
−40 °C to
+125 °C
Unit
Min
Typ[1]
Max
Min
Max
Min
Max
tW
pulse width
nA LOW; see Figure 8
VCC = 2.0 V
80
16
14
17
6
-
-
-
100
20
-
-
-
120
24
-
-
-
ns
ns
ns
VCC = 4.5 V
VCC = 6.0 V
5
17
20
nB HIGH; see Figure 8
VCC = 2.0 V
80
16
14
17
6
-
-
-
100
20
-
-
-
120
24
-
-
-
ns
ns
ns
VCC = 4.5 V
VCC = 6.0 V
5
17
20
nCD LOW; see Figure 8
VCC = 2.0 V
80
16
14
19
7
-
-
-
100
20
-
-
-
120
24
-
-
-
ns
ns
ns
VCC = 4.5 V
VCC = 6.0 V
6
17
20
nQ and nQ HIGH or LOW;
see Figure 8
VCC = 5.0 V;
630
700
770
602
798
595
805 µs
C
R
EXT = 0.1 µF;
EXT = 10 kΩ
trec
recovery time nCD to nA, nB;
see Figure 8
VCC = 2.0 V
VCC = 4.5 V
VCC = 6.0 V
35
7
6
2
2
-
-
-
45
9
-
-
-
55
11
9
-
-
-
ns
ns
ns
6
8
trtrig
retrigger time nA, nB; see Figure 8;
X = CEXT / (4.5 × VCC
)
VCC = 2.0 V
VCC = 4.5 V
VCC = 6.0 V
-
-
455 + X
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
ns
ns
ns
kΩ
kΩ
80 + X
-
-
-
55 + X
-
-
REXT
external timing
resistor
VCC = 2.0 V
VCC = 5.0 V
10
2
-
-
1000
1000
-
-
CEXT
CPD
external timing
capacitor
no limits
[3]
power
dissipation
capacitance
per multivibrator;
VI = GND to VCC
-
136
-
-
-
-
-
pF
74HC_HCT4538_3
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 03 — 8 June 2009
10 of 24
74HC4538; 74HCT4538
NXP Semiconductors
Dual retriggerable precision monostable multivibrator
Table 7.
Dynamic characteristics …continued
Voltages are referenced to GND (ground = 0 V); for test circuit see Figure 9.
Symbol Parameter
Conditions
25 °C
−40 °C to
+85 °C
−40 °C to
+125 °C
Unit
Min
Typ[1]
Max
Min
Max
Min
Max
74HCT4538
tPLH
LOW to HIGH nA, nB to nQ;
propagation
delay
see Figure 7
VCC = 4.5 V
-
-
35
30
60
-
-
75
-
90
ns
ns
VCC = 5.0 V; CL = 15 pF
nCD to nQ; see Figure 7
VCC = 4.5 V
-
-
-
-
-
35
60
-
75
-
90
ns
tPHL
HIGH to LOW nA, nB to nQ;
propagation
delay
see Figure 7
VCC = 4.5 V
-
-
35
30
60
-
-
-
75
-
-
-
90
-
ns
ns
VCC = 5.0 V; CL = 15 pF
nCD to nQ; see Figure 7
VCC = 4.5 V
-
35
7
60
15
-
-
75
19
-
-
90
21
-
ns
ns
ns
ns
ns
[2]
tt
transition time nQ and nQ; see Figure 7
VCC = 4.5 V
-
-
-
tW
pulse width
nA LOW; see Figure 8
VCC = 4.5 V
20
16
20
11
5
25
20
25
30
24
30
nB HIGH; see Figure 8
VCC = 4.5 V
-
-
-
nCD LOW; see Figure 8
VCC = 4.5 V
11
-
-
-
nQ and nQ HIGH or LOW;
see Figure 8
VCC = 5.0 V;
630
700
770
602
798
595
11
805 µs
C
R
EXT = 0.1 µF;
EXT = 10 kΩ
trec
recovery time nCD to nA, nB;
see Figure 8
VCC = 4.5 V
7
2
-
9
-
-
ns
trtrig
retrigger time nA, nB; see Figure 8;
X = CEXT / (4.5 × VCC
)
VCC = 4.5 V
-
80 + X
-
-
-
-
-
-
-
-
-
-
ns
REXT
CEXT
external timing
resistor
VCC = 5.0 V
2
1000
kΩ
external timing
capacitor
VCC = 5.0 V
no limits
74HC_HCT4538_3
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 03 — 8 June 2009
11 of 24
74HC4538; 74HCT4538
NXP Semiconductors
Dual retriggerable precision monostable multivibrator
Table 7.
Dynamic characteristics …continued
Voltages are referenced to GND (ground = 0 V); for test circuit see Figure 9.
Symbol Parameter
Conditions
25 °C
−40 °C to
+85 °C
−40 °C to
+125 °C
Unit
Min
Typ[1]
Max
Min
Max
Min
Max
[3]
CPD
power
per multivibrator;
-
138
-
-
-
-
-
pF
dissipation
capacitance
VI = GND to (VCC − 1.5 V)
[1] Typical values are measured at nominal supply voltage (VCC = 3.3 V and VCC = 5.0 V).
[2] tt is the same as tTHL and tTLH
.
[3] CPD is used to determine the dynamic power dissipation (PD in µW).
PD = CPD × VCC2 × fi × Σ(CL × VCC2 × fo) + 0.48 × CEXT × VCC2 × fo + D × 0.8 × VCC where:
fi = input frequency in MHz;
fo = output frequency in MHz;
Σ(CL × VCC2 × fo) = sum of the outputs;
CL = output load capacitance in pF;
VCC = supply voltage in V;
D = duty cycle factor in %;
CEXT = external timing capacitance in pF.
11. Waveforms
V
I
nB input
GND
V
M
t
W
V
I
nA input
GND
V
M
t
W
V
I
nCD input
GND
V
M
t
t
t
PHL
PLH
PLH
PHL
V
OH
V
Y
nQ output
V
V
M
M
V
X
V
OL
t
t
t
t
t
PLH
PHL
THL
TLH
V
OH
V
Y
nQ output
V
M
V
X
V
OL
001aak194
Measurement points are given in Table 8.
Logic levels: VOL and VOH are typical output levels that occur with the output load.
Fig 7. Waveforms showing propagation delays and transition times
74HC_HCT4538_3
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 03 — 8 June 2009
12 of 24
74HC4538; 74HCT4538
NXP Semiconductors
Dual retriggerable precision monostable multivibrator
V
I
nCD input
GND
V
M
t
t
t
W
W
rec
V
I
nA input
GND
V
M
t
W
V
I
nB input
GND
V
M
t
rtrig
V
OH
nQ, nQ output
V
M
V
OL
t
W
001aak195
Measurement points are given in Table 8.
Logic levels: VOL and VOH are typical output levels that occur with the output load.
Fig 8. Waveforms showing nA, nB, nQ, nQ pulse widths, recovery and retrigger times
Table 8.
Type
Measurement points
Input
VM
Output
VM
VX
VY
74HC4538
0.5VCC
1.3 V
0.5VCC
1.3 V
0.1VCC
0.1VCC
0.9VCC
0.9VCC
74HCT4538
74HC_HCT4538_3
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 03 — 8 June 2009
13 of 24
74HC4538; 74HCT4538
NXP Semiconductors
Dual retriggerable precision monostable multivibrator
t
W
V
I
90 %
negative
pulse
V
V
V
M
M
10 %
0 V
t
t
r
f
t
t
f
r
V
I
90 %
positive
pulse
V
M
M
10 %
0 V
t
W
V
V
CC
CC
V
V
O
I
R
L
S1
G
open
DUT
R
T
C
L
001aad983
Test data is given in Table 9.
Definitions test circuit:
RT = Termination resistance should be equal to output impedance Zo of the pulse generator.
CL = Load capacitance including jig and probe capacitance.
RL = Load resistance.
S1 = Test selection switch
Fig 9. Test circuit for measuring switching times
Table 9.
Type
Test data
Input
VI
Load
S1 position
tPHL, tPLH
open
tr, tf
6 ns
6 ns
CL
RL
74HC4538
VCC
3 V
15 pF, 50 pF
15 pF, 50 pF
1 kΩ
1 kΩ
74HCT4538
open
74HC_HCT4538_3
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 03 — 8 June 2009
14 of 24
74HC4538; 74HCT4538
NXP Semiconductors
Dual retriggerable precision monostable multivibrator
12. Application information
12.1 Power-down considerations
A large capacitor (CEXT) may cause problems when powering-down the monostable due
to energy stored in this capacitor. When a system containing this device is powered-down
or rapid decrease of VCC to zero occurs, the monostable may sustain damage, due to the
capacitor discharging through the input protection diodes. To avoid this possibility, use a
damping diode (DEXT) preferably a germanium or Schottky type diode able to withstand
large current surges and connect as shown in Figure 10
D
R
EXT
C
EXT
EXT
V
GND
CC
nCEXT
nREXT/CEXT
001aak193
Fig 10. Power-down protection circuit
12.2 Graphs
001aak196
1.6
1.12
1 kΩ
2 kΩ
normalized
K factor
(K)
R
C
(t
×
EXT
5.6 kΩ
51 kΩ
1 MΩ
EXT
)
W
1.2
1.0
0.8
0.6
0.84
0.70
0.56
0.42
−10
−9
−8
−7
−6
−5
−4
10
10
10
10
10
10
10
C
EXT
(F)
VCC = 4.5 V; Tamb = 25 °C.
Fig 11. Typical pulse width accuracy versus external capacitance
74HC_HCT4538_3
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 03 — 8 June 2009
15 of 24
74HC4538; 74HCT4538
NXP Semiconductors
Dual retriggerable precision monostable multivibrator
001aak197
1.12
1.6
normalized
K factor
(K)
R
C
(t
×
EXT
EXT
)
W
1.2
1.0
0.8
0.6
0.84
0.70
0.56
0.42
1 nF
> 100 nF
3
4
5
6
10
10
10
10
R
EXT
(Ω)
VCC = 4.5 V; Tamb = 25 °C.
Fig 12. Typical pulse width accuracy versus external resistance
001aak198
1.6
1.12
normalized
K factor
(K)
R
C
(t
×
EXT
EXT
)
W
1.2
1.0
0.8
0.6
0.84
0.70
0.56
0.42
+10 %
R
EXT
−10 %
−10
−9
−8
−7
−6
−5
−4
10
10
10
10
10
10
10
C
EXT
(F)
VCC = 4.5 V; REXT = 10 kΩ; Tamb = 25 °C.
Fig 13. Typical pulse width accuracy versus external capacitance
001aak199
1.7
1.19
2 kΩ
1 kΩ
normalized
K factor
(K)
R
C
(t
×
EXT
EXT
)
5.6 kΩ
W
1.3
1.1
0.9
0.7
0.91
0.77
0.63
0.49
10 kΩ
1 MΩ
1
2
3
4
5
6
V
(V)
CC
CEXT = 1 nF; Tamb = 25 °C.
Fig 14. Typical pulse width accuracy versus power supply
74HC_HCT4538_3
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 03 — 8 June 2009
16 of 24
74HC4538; 74HCT4538
NXP Semiconductors
Dual retriggerable precision monostable multivibrator
001aak200
1.19
1.7
normalized
K factor
(K)
R
C
(t
×
EXT
EXT
)
W
1 kΩ
2 kΩ
1.3
1.1
0.9
0.91
0.77
0.63
0.49
5.6 kΩ
1 MΩ
0.7
1
2
3
4
5
6
V
(V)
CC
CEXT = 100 nF; Tamb = 25 °C.
Fig 15. Typical pulse width accuracy versus power supply
001aak201
1.7
1.19
1 kΩ
normalized
K factor
(K)
R
C
(t
×
EXT
EXT
)
W
2 kΩ
1.3
1.1
0.9
0.7
0.91
5.6 kΩ
1 MΩ 0.77
0.63
0.49
150
−50
0
50
100
T
(°C)
amb
VCC = 4.5 V; CEXT = 1 nF; Tamb = 25 °C.
Fig 16. Typical pulse width accuracy versus temperature
001aak202
1.7
1.19
normalized
K factor
(K)
R
C
(t
×
EXT
EXT
)
W
1.3
1.1
0.9
0.7
0.91
0.77
0.63
0.49
1 kΩ
2 kΩ
5.6 kΩ
1 MΩ
−50
0
50
100
150
T
(°C)
amb
VCC = 4.5 V; CEXT = 1 µF; Tamb = 25 °C.
Fig 17. Typical pulse width accuracy versus temperature
74HC_HCT4538_3
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 03 — 8 June 2009
17 of 24
74HC4538; 74HCT4538
NXP Semiconductors
Dual retriggerable precision monostable multivibrator
13. Package outline
DIP16: plastic dual in-line package; 16 leads (300 mil)
SOT38-4
D
M
E
A
2
A
A
1
L
c
e
w M
Z
b
1
(e )
1
b
b
2
16
9
M
H
pin 1 index
E
1
8
0
5
10 mm
scale
DIMENSIONS (inch dimensions are derived from the original mm dimensions)
(1)
A
A
A
2
(1)
(1)
Z
1
w
UNIT
mm
b
b
b
c
D
E
e
e
L
M
M
H
1
2
1
E
max.
min.
max.
max.
1.73
1.30
0.53
0.38
1.25
0.85
0.36
0.23
19.50
18.55
6.48
6.20
3.60
3.05
8.25
7.80
10.0
8.3
4.2
0.51
3.2
2.54
0.1
7.62
0.3
0.254
0.01
0.76
0.068 0.021 0.049 0.014
0.051 0.015 0.033 0.009
0.77
0.73
0.26
0.24
0.14
0.12
0.32
0.31
0.39
0.33
inches
0.17
0.02
0.13
0.03
Note
1. Plastic or metal protrusions of 0.25 mm (0.01 inch) maximum per side are not included.
REFERENCES
OUTLINE
EUROPEAN
PROJECTION
ISSUE DATE
VERSION
IEC
JEDEC
JEITA
95-01-14
03-02-13
SOT38-4
Fig 18. Package outline SOT38-4 (DIP16)
74HC_HCT4538_3
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 03 — 8 June 2009
18 of 24
74HC4538; 74HCT4538
NXP Semiconductors
Dual retriggerable precision monostable multivibrator
SO16: plastic small outline package; 16 leads; body width 3.9 mm
SOT109-1
D
E
A
X
v
c
y
H
M
A
E
Z
16
9
Q
A
2
A
(A )
3
A
1
pin 1 index
θ
L
p
L
1
8
e
w
M
detail X
b
p
0
2.5
scale
5 mm
DIMENSIONS (inch dimensions are derived from the original mm dimensions)
A
(1)
(1)
(1)
UNIT
A
A
A
b
c
D
E
e
H
L
L
p
Q
v
w
y
Z
θ
1
2
3
p
E
max.
0.25
0.10
1.45
1.25
0.49
0.36
0.25
0.19
10.0
9.8
4.0
3.8
6.2
5.8
1.0
0.4
0.7
0.6
0.7
0.3
mm
1.27
0.05
1.05
0.041
1.75
0.25
0.01
0.25
0.01
0.25
0.1
8o
0o
0.010 0.057
0.004 0.049
0.019 0.0100 0.39
0.014 0.0075 0.38
0.16
0.15
0.244
0.228
0.039 0.028
0.016 0.020
0.028
0.012
inches
0.069
0.01 0.004
Note
1. Plastic or metal protrusions of 0.15 mm (0.006 inch) maximum per side are not included.
REFERENCES
OUTLINE
EUROPEAN
PROJECTION
ISSUE DATE
VERSION
IEC
JEDEC
JEITA
99-12-27
03-02-19
SOT109-1
076E07
MS-012
Fig 19. Package outline SOT109-1 (SO16)
74HC_HCT4538_3
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 03 — 8 June 2009
19 of 24
74HC4538; 74HCT4538
NXP Semiconductors
Dual retriggerable precision monostable multivibrator
SSOP16: plastic shrink small outline package; 16 leads; body width 5.3 mm
SOT338-1
D
E
A
X
c
y
H
v
M
A
E
Z
9
16
Q
A
2
A
(A )
3
A
1
pin 1 index
θ
L
p
L
8
1
detail X
w
M
b
p
e
0
2.5
5 mm
scale
DIMENSIONS (mm are the original dimensions)
A
(1)
(1)
(1)
UNIT
A
A
A
b
c
D
E
e
H
L
L
Q
v
w
y
Z
θ
p
p
1
2
3
E
max.
8o
0o
0.21
0.05
1.80
1.65
0.38
0.25
0.20
0.09
6.4
6.0
5.4
5.2
7.9
7.6
1.03
0.63
0.9
0.7
1.00
0.55
mm
2
0.25
0.65
1.25
0.2
0.13
0.1
Note
1. Plastic or metal protrusions of 0.25 mm maximum per side are not included.
REFERENCES
OUTLINE
EUROPEAN
PROJECTION
ISSUE DATE
VERSION
IEC
JEDEC
JEITA
99-12-27
03-02-19
SOT338-1
MO-150
Fig 20. Package outline SOT338-1 (SSOP16)
74HC_HCT4538_3
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 03 — 8 June 2009
20 of 24
74HC4538; 74HCT4538
NXP Semiconductors
Dual retriggerable precision monostable multivibrator
TSSOP16: plastic thin shrink small outline package; 16 leads; body width 4.4 mm
SOT403-1
D
E
A
X
c
y
H
v
M
A
E
Z
9
16
Q
(A )
3
A
2
A
A
1
pin 1 index
θ
L
p
L
1
8
detail X
w
M
b
p
e
0
2.5
5 mm
scale
DIMENSIONS (mm are the original dimensions)
A
(1)
(2)
(1)
UNIT
A
A
A
b
c
D
E
e
H
L
L
Q
v
w
y
Z
θ
1
2
3
p
E
p
max.
8o
0o
0.15
0.05
0.95
0.80
0.30
0.19
0.2
0.1
5.1
4.9
4.5
4.3
6.6
6.2
0.75
0.50
0.4
0.3
0.40
0.06
mm
1.1
0.65
0.25
1
0.2
0.13
0.1
Notes
1. Plastic or metal protrusions of 0.15 mm maximum per side are not included.
2. Plastic interlead protrusions of 0.25 mm maximum per side are not included.
REFERENCES
OUTLINE
EUROPEAN
PROJECTION
ISSUE DATE
VERSION
IEC
JEDEC
JEITA
99-12-27
03-02-18
SOT403-1
MO-153
Fig 21. Package outline SOT403-1 (TSSOP16)
74HC_HCT4538_3
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 03 — 8 June 2009
21 of 24
74HC4538; 74HCT4538
NXP Semiconductors
Dual retriggerable precision monostable multivibrator
14. Abbreviations
Table 10. Abbreviations
Acronym
CMOS
DUT
Description
Complementary Metal-Oxide Semiconductor
Device Under Test
ESD
ElectroStatic Discharge
Human Body Model
HBM
LSTTL
MM
Low-power Schottky Transistor-Transistor Logic
Machine Model
TTL
Transistor-Transistor Logic
15. Revision history
Table 11. Revision history
Document ID
Release date
20090608
Data sheet status
Change notice
Supersedes
74HC_HCT4538_3
Modifications:
Product data sheet
-
74HC_HCT4538_CNV_2
• The format of this data sheet has been redesigned to comply with the new identity
guidelines of NXP Semiconductors.
• Legal texts have been adapted to the new company name where appropriate.
• Pin names changed throughout.
• Section Section 7, Section 8 and Section 9 added, taken from the 74HC/T HCMOS Family
characteristics/specification (March 1988).
• Test circuit added: Figure 9.
• Quick reference data incorporated in to Section 9 and Section 10.
• Package information added for DIP16, SO16, SSOP16 and TSSOP16 packages.
74HC_HCT4538_CNV_2 19970902
Product specification
-
-
74HC_HCT4538_3
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 03 — 8 June 2009
22 of 24
74HC4538; 74HCT4538
NXP Semiconductors
Dual retriggerable precision monostable multivibrator
16. Legal information
16.1 Data sheet status
Document status[1][2]
Product status[3]
Development
Definition
Objective [short] data sheet
This document contains data from the objective specification for product development.
This document contains data from the preliminary specification.
This document contains the product specification.
Preliminary [short] data sheet Qualification
Product [short] data sheet Production
[1]
[2]
[3]
Please consult the most recently issued document before initiating or completing a design.
The term ‘short data sheet’ is explained in section “Definitions”.
The product status of device(s) described in this document may have changed since this document was published and may differ in case of multiple devices. The latest product status
information is available on the Internet at URL http://www.nxp.com.
damage. NXP Semiconductors accepts no liability for inclusion and/or use of
NXP Semiconductors products in such equipment or applications and
therefore such inclusion and/or use is at the customer’s own risk.
16.2 Definitions
Draft — The document is a draft version only. The content is still under
internal review and subject to formal approval, which may result in
modifications or additions. NXP Semiconductors does not give any
representations or warranties as to the accuracy or completeness of
information included herein and shall have no liability for the consequences of
use of such information.
Applications — Applications that are described herein for any of these
products are for illustrative purposes only. NXP Semiconductors makes no
representation or warranty that such applications will be suitable for the
specified use without further testing or modification.
Limiting values — Stress above one or more limiting values (as defined in
the Absolute Maximum Ratings System of IEC 60134) may cause permanent
damage to the device. Limiting values are stress ratings only and operation of
the device at these or any other conditions above those given in the
Characteristics sections of this document is not implied. Exposure to limiting
values for extended periods may affect device reliability.
Short data sheet — A short data sheet is an extract from a full data sheet
with the same product type number(s) and title. A short data sheet is intended
for quick reference only and should not be relied upon to contain detailed and
full information. For detailed and full information see the relevant full data
sheet, which is available on request via the local NXP Semiconductors sales
office. In case of any inconsistency or conflict with the short data sheet, the
full data sheet shall prevail.
Terms and conditions of sale — NXP Semiconductors products are sold
subject to the general terms and conditions of commercial sale, as published
at http://www.nxp.com/profile/terms, including those pertaining to warranty,
intellectual property rights infringement and limitation of liability, unless
explicitly otherwise agreed to in writing by NXP Semiconductors. In case of
any inconsistency or conflict between information in this document and such
terms and conditions, the latter will prevail.
16.3 Disclaimers
General — Information in this document is believed to be accurate and
reliable. However, NXP Semiconductors does not give any representations or
warranties, expressed or implied, as to the accuracy or completeness of such
information and shall have no liability for the consequences of use of such
information.
No offer to sell or license — Nothing in this document may be interpreted
or construed as an offer to sell products that is open for acceptance or the
grant, conveyance or implication of any license under any copyrights, patents
or other industrial or intellectual property rights.
Right to make changes — NXP Semiconductors reserves the right to make
changes to information published in this document, including without
limitation specifications and product descriptions, at any time and without
notice. This document supersedes and replaces all information supplied prior
to the publication hereof.
Export control — This document as well as the item(s) described herein
may be subject to export control regulations. Export might require a prior
authorization from national authorities.
Suitability for use — NXP Semiconductors products are not designed,
authorized or warranted to be suitable for use in medical, military, aircraft,
space or life support equipment, nor in applications where failure or
malfunction of an NXP Semiconductors product can reasonably be expected
to result in personal injury, death or severe property or environmental
16.4 Trademarks
Notice: All referenced brands, product names, service names and trademarks
are the property of their respective owners.
17. Contact information
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: salesaddresses@nxp.com
74HC_HCT4538_3
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 03 — 8 June 2009
23 of 24
74HC4538; 74HCT4538
NXP Semiconductors
Dual retriggerable precision monostable multivibrator
18. Contents
1
2
3
4
General description . . . . . . . . . . . . . . . . . . . . . . 1
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Ordering information. . . . . . . . . . . . . . . . . . . . . 2
Functional diagram . . . . . . . . . . . . . . . . . . . . . . 2
5
5.1
5.2
Pinning information. . . . . . . . . . . . . . . . . . . . . . 4
Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 4
6
Functional description . . . . . . . . . . . . . . . . . . . 5
Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . . 6
Recommended operating conditions. . . . . . . . 7
Static characteristics. . . . . . . . . . . . . . . . . . . . . 7
Dynamic characteristics . . . . . . . . . . . . . . . . . . 9
Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
7
8
9
10
11
12
12.1
12.2
Application information. . . . . . . . . . . . . . . . . . 15
Power-down considerations . . . . . . . . . . . . . . 15
Graphs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
13
14
15
Package outline . . . . . . . . . . . . . . . . . . . . . . . . 18
Abbreviations. . . . . . . . . . . . . . . . . . . . . . . . . . 22
Revision history. . . . . . . . . . . . . . . . . . . . . . . . 22
16
Legal information. . . . . . . . . . . . . . . . . . . . . . . 23
Data sheet status . . . . . . . . . . . . . . . . . . . . . . 23
Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Trademarks. . . . . . . . . . . . . . . . . . . . . . . . . . . 23
16.1
16.2
16.3
16.4
17
18
Contact information. . . . . . . . . . . . . . . . . . . . . 23
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Please be aware that important notices concerning this document and the product(s)
described herein, have been included in section ‘Legal information’.
© NXP B.V. 2009.
All rights reserved.
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: salesaddresses@nxp.com
Date of release: 8 June 2009
Document identifier: 74HC_HCT4538_3
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