74LVCH245ADB [NXP]
Octal bus transceiver with direction pin with 5-volt tolerant inputs/outputs 3-State; 八路总线收发器方向引脚5伏耐输入/输出三态
| 型号： | 74LVCH245ADB |
| 厂家： | 
NXP |
| 描述： | Octal bus transceiver with direction pin with 5-volt tolerant inputs/outputs 3-State |
| 文件： | 总10页 (文件大小：101K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
INTEGRATED CIRCUITS
74LVC245A/74LVCH245A
Octal bus transceiver with direction pin
with 5-volt tolerant inputs/outputs
(3-State)
Product specification
1998 May 20
Supersedes data of 1997 Dec 19
IC24 Data Handbook
Philips
Semiconductors
Philips Semiconductors
Product specification
Octal bus transceiver with direction pin with
5-volt tolerant inputs/outputs (3-State)
74LVC245A
74LVCH245A
FEATURES
DESCRIPTION
The 74LVC245A/74LVCH245A is a high-performance, low-power,
low-voltage, Si-gate CMOS device, superior to most advanced
CMOS compatible TTL families.
• 5-volt tolerant inputs/outputs, for interfacing with 5-volt logic
• Supply voltage range of 2.7V to 3.6V
• Complies with JEDEC standard no. 8-1A
• CMOS low power consumption
Inputs can be driven from either 3.3V or 5V devices. In 3-State
operation, outputs can handle 5V. These features allow the use of
these devices as translators in a mixed 3.3V/5V environment.
• Direct interface with TTL levels
The 74LVC245A/74LVCH245A is an octal transceiver featuring
non-inverting 3-State bus compatible outputs in both send and
receive directions. The ’245’ features an output enable (OE) input for
easy cascading and a send/receive (DIR) input for direction control.
OE controls the outputs so that the buses are effectively isolated.
• High impedance when V = 0V
CC
• Bushold on all data inputs (74LVCH245A only)
The ’245’ is functionally identical to the ’640’, but the ’640’ has true
(non-inverting) outputs.
QUICK REFERENCE DATA
SYMBOL
PARAMETER
CONDITIONS
TYPICAL
UNIT
Propagation delay
C = 50pF
L
A to B
V
CC
= 3.3V
3.6
t
/t
ns
n
n;
n
PHL PLH
B to A
n
C
C
Input capacitance
5.0
pF
pF
I
Input/output capacitance
10.0
I/O
Power dissipation capacitance per
buffer
C
Notes 1 and 2
33
pF
PD
NOTE:
1. C is used to determine the dynamic power dissipation (P in mW):
PD
D
2
2
P
= C x V
x f + S (C x V
x f ) where:
D
PD
CC
i
L
CC o
f = input frequency in MHz; C = output load capacity in pF;
i
L
f = output frequency in MHz; V = supply voltage in V;
o
CC
2
S (C x V
x f ) = sum of outputs.
L
CC
o
2. The condition is V = GND to V
I
CC
ORDERING INFORMATION
TEMPERATURE
RANGE
OUTSIDE
NORTH AMERICA
PACKAGES
NORTH AMERICA
PKG. DWG. #
20-Pin Plastic Shrink Small Outline (SO)
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
74LVC245A D
74LVC245A DB
74LVC245A PW
74LVCH245A D
74LVCH245A DB
74LVCH245A PW
74LVC245A D
74LVC245A DB
7LVC245APW DH
74LVCH245A D
74LVCH245A DB
LVCH245APW DH
SOT163-1
SOT339-1
SOT360-1
SOT163-1
SOT339-1
SOT360-1
20-Pin Plastic Shrink Small Outline (SSOP) Type II
20-Pin Plastic Thin Shrink Small Outline (TSSOP) Type I
20-Pin Plastic Shrink Small Outline (SO)
20-Pin Plastic Shrink Small Outline (SSOP) Type II
20-Pin Plastic Thin Shrink Small Outline (TSSOP) Type I
2
1998 May 20
853-2044 19419
Philips Semiconductors
Product specification
74LVC245A
74LVCH245A
Octal bus transceiver with direction pin with
5-volt tolerant inputs/outputs (3-State)
PIN CONFIGURATION
LOGIC SYMBOL
1
DIR
19
20
19
18
17
16
15
14
13
12
11
1
V
DIR
OE
CC
2
3
A0
A1
OE
B0
B1
B2
B3
B4
B5
B6
B7
2
3
4
5
6
7
8
9
A0
A1
A2
A3
A4
A5
A6
A7
18
B0
4
A2
17
B1
5
A3
6
A4
16
B2
7
A5
8
15
B3
A6
9
A7
14
B4
10
GND
SV00014
13
B5
12
B6
PIN DESCRIPTION
11
PIN NUMBER SYMBOL
FUNCTION
B7
SV00016
1
DIR
Direction control
2, 3, 4, 5, 6,
7, 8, 9
A to A
Data inputs/outputs
LOGIC SYMBOL (IEEE/IEC)
0
7
7
10
GND
Ground (0V)
19
G3
18, 17, 16, 15,
14, 13, 12, 11
B to B
0
Data inputs/outputs
3EN1 (BA)
1
3EN2 (AB)
19
20
OE
Output enable input (active-Low)
Positive supply voltage
V
CC
1
2
18
2
3
4
5
6
17
16
15
14
FUNCTION TABLE
INPUTS
INPUTS/OUTPUTS
OE
L
DIR
L
B
0
An
A = B
Inputs
B = A
Z
7
8
9
13
12
11
L
H
lnputs
Z
H
X
H
L
X
Z
= HIGH voltage level
= LOW voltage level
= Don’t care
SV00208
= High impedance OFF-state
3
1998 May 20
Philips Semiconductors
Product specification
74LVC245A
74LVCH245A
Octal bus transceiver with direction pin with
5-volt tolerant inputs/outputs (3-State)
RECOMMENDED OPERATING CONDITIONS
LIMITS
SYMBOL
PARAMETER
CONDITIONS
UNIT
MAX
MIN
2.7
1.2
0
DC supply voltage (for max. speed performance)
DC supply voltage (for low-voltage applications)
DC Input voltage range
3.6
V
CC
V
3.6
V
I
5.5
V
V
DC Output voltage range; output HIGH or LOW
state
0
V
CC
V
O
DC output voltage range; output 3-State
0
5.5
T
amb
Operating ambient temperature range in free-air
–40
+85
°C
V
CC
V
CC
= 1.2 to 2.7V
= 2.7 to 3.6V
0
0
20
10
t , t
r
Input rise and fall times
ns/V
f
1
ABSOLUTE MAXIMUM RATINGS
In accordance with the Absolute Maximum Rating System (IEC 134)
Voltages are referenced to GND (ground = 0V)
SYMBOL
PARAMETER
DC supply voltage
CONDITIONS
RATING
UNIT
V
V
CC
I
IK
–0.5 to +6.5
–50
DC input diode current
V t0
mA
V
I
V
I
DC input voltage
Note 2
uV or V t 0
–0.5 to +6.5
"50
I
DC output diode current
V
O
mA
OK
CC
O
DC output voltage; output HIGH or LOW state
DC output voltage; output 3-State
DC output source or sink current
Note 2
Note 2
–0.5 to V +0.5
CC
V
V
O
–0.5 to 6.5
"50
I
O
V
O
= 0 to V
CC
mA
mA
°C
I
, I
DC V or GND current
"100
GND CC
CC
T
stg
Storage temperature range
–65 to +150
Power dissipation per package
– plastic mini-pack (SO)
– plastic shrink mini-pack (SSOP and TSSOP)
P
TOT
above +70°C derate linearly with 8 mW/K
above +60°C derate linearly with 5.5 mW/K
500
500
mW
NOTES:
1. Stresses beyond those listed may cause permanent damage to the device. These are stress ratings only and functional operation of the
device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to
absolute-maximum-rated conditions for extended periods may affect device reliability.
2. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
4
1998 May 20
Philips Semiconductors
Product specification
74LVC245A
74LVCH245A
Octal bus transceiver with direction pin with
5-volt tolerant inputs/outputs (3-State)
DC ELECTRICAL CHARACTERISTICS
Over recommended operating conditions voltages are referenced to GND (ground = 0V)
LIMITS
SYMBOL
PARAMETER
TEST CONDITIONS
Temp = -40°C to +85°C
UNIT
1
MIN
TYP
MAX
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
= 1.2V
V
CC
V
HIGH level Input voltage
LOW level Input voltage
V
V
IH
= 2.7 to 3.6V
= 1.2V
2.0
GND
0.8
V
IL
= 2.7 to 3.6V
= 2.7V; V = V or V ; I = –12mA
V
V
V
V
*0.5
I
IH
IL
O
CC
CC
CC
CC
= 3.0V; V = V or V ; I = –100µA
*0.2
*0.6
*0.8
V
CC
I
IH
IL
O
O
O
V
OH
HIGH level output voltage
LOW level output voltage
V
= 3.0V; V = V or V
I
I
= –18mA
= –24mA
I
IH
IL;
IL;
= 3.0V; V = V or V
I
IH
= 2.7V; V = V or V ; I = 12mA
0.40
0.20
0.55
"5
I
IH
IL
O
= 3.0V; V = V or V ; I = 100µA
V
OL
V
I
IH
IL
O
O
= 3.0V; V = V or V
I
= 24mA
I
IH
IL;
6
I
Input leakage current
= 3.6V; V = 5.5V or GND
µA
µA
µA
µA
"0.1
0.1
I
I
6, 7
I
3-State output OFF-state current
Power off leakage supply
Quiescent supply current
= 3.6V; V = V or V ; V = 5.5V or GND
I IH IL O
"5
OZ
I
off
= 0.0V; V or V = 5.5V
0.1
"10
10
I
O
I
= 3.6V; V = V or GND; I = 0
0.1
CC
I
CC
O
Additional quiescent supply current
per input pin
∆I
V
CC
V
CC
V
CC
= 2.7V to 3.6V; V = V –0.6V; I = 0
5
–
–
500
–
µA
µA
µA
CC
I
CC
O
Bushold LOW sustaining
I
= 3.0V; V =0.8V
75
BHL
I
2, 3, 4
current
Bushold HIGH sustaining
I
= 3.0V; V =2.0V
–75
–
BHH
I
2, 3, 4
current
2, 3, 5
I
Bushold LOW overdrive current
Bushold HIGH overdrive current
V
V
= 3.6V
= 3.6V
500
–
–
–
–
µA
µA
BHLO
CC
2, 3, 5
I
–500
BHHO
CC
NOTES:
1. All typical values are at V = 3.3V and T
= 25°C.
amb
CC
2. Valid for data inputs of bushold parts (LVCH-A) only.
3. For data inputs only, control inputs do not have a bushold circuit.
4. The specified sustaining current at the data input holds the input below the specified V level.
I
5. The specified overdrive current at the data input forces the data input to the opposite logic input state.
6. For bushold parts, the bushold circuit is switched off when V exceeds V allowing 5.5V on the input terminal.
I
CC
7. For I/O ports the parameter I includes the input leakage current.
OZ
5
1998 May 20
Philips Semiconductors
Product specification
74LVC245A
74LVCH245A
Octal bus transceiver with direction pin with
5-volt tolerant inputs/outputs (3-State)
AC CHARACTERISTICS
GND = 0V; t = t v 2.5ns; C = 50pF; R = 500Ω; T
= –40°C to +85°C.
r
f
L
L
amb
LIMITS
V
SYMBOL
PARAMETER
WAVEFORM
V
CC
= 3.3V ±0.3V
= 2.7V
V = 1.2V
CC
UNIT
CC
1
MIN
TYP
MAX
MIN
MAX
TYP
Propagation delay
t
t
PHL
PLH
A to B ;
1, 3
2, 3
2, 3
1.5
1.5
1.5
3.6
6.3
8.5
7.0
1.5
7.3
9.5
8.0
16
23
16
ns
ns
ns
n
n
n
B to A
n
3-State output enable time
t
t
PZH
PZL
OE to A ;
5.1
4.5
1.5
1.5
n
n
OE to B
3-State output disable time
t
PHZ
OE to A ;
n
n
t
PLZ
OE to B
NOTE:
1. Unless otherwise stated, all typical values are at V = 3.3V and T
= 25°C.
amb
CC
AC WAVEFORMS
TEST CIRCUIT
V
= 1.5V at V w 2.7V; V = 0.5 V at V t 2.7V.
M
CC M CC CC
S
1
V
OL
and V are the typical output voltage drop that occur with the
OH
V
CC
2<V
CC
output load.
Open
GND
V
X
V
Y
= V + 0.3V at V w 2.7V; V = V + 0.1 V at V t2.7V
OL CC X OL CC CC
= V –0.3V at V w2.7V; V = V – 0.1 V at V t2.7V
OH
CC
Y
OH
CC
CC
R =500 Ω
L
V
V
OUT
IN
V
I
PULSE
GENERATOR
D.U.T.
INPUT
GND
V
M
t
R =500 Ω
L
R
C
T
L
t
PHL
PLH
V
OH
Test Circuit for 3-State Outputs
SWITCH POSITION
OUTPUT
V
M
V
V
IN
TEST
SWITCH
Open
CC
V
OL
t 2.7V
2.7 – 3.6V 2.7V
V
CC
SY00041
t
/t
PLH PHL
Waveform 1. Input (D ) to output (Qn) propagation delays.
t
/t
2<V
CC
PLZ PZL
n
t
/t
GND
PHZ PZH
V
I
DEFINITIONS
R = Load resistor
C = Load capacitance includes jig and probe capacitance
L
L
V
nOE INPUT
GND
M
R = Termination resistance should be equal to Z
T
OUT
of pulse generators.
SW00047
t
t
PZL
PLZ
Waveform 3. Load circuitry for switching times.
V
CC
Q
n
OUTPUT
LOW-to-OFF
OFF-to-LOW
V
M
V
X
V
OL
t
t
PZH
PHZ
V
OH
Q
n
OUTPUT
V
Y
HIGH-to-OFF
OFF-to-HIGH
V
M
GND
outputs
enabled
outputs
enabled
outputs
disabled
SW00207
Waveform 2. 3-State enable and disable times.
6
1998 May 20
Philips Semiconductors
Product specification
Octal bus transceiver with direction pin with 5-volt
tolerant inputs/outputs (3-State)
74LVC245A
74LVCH245A
SO20: plastic small outline package; 20 leads; body width 7.5 mm
SOT163-1
7
1998 May 20
Philips Semiconductors
Product specification
Octal bus transceiver with direction pin with 5-volt
tolerant inputs/outputs (3-State)
74LVC245A
74LVCH245A
SSOP20: plastic shrink small outline package; 20 leads; body width 5.3 mm
SOT339-1
8
1998 May 20
Philips Semiconductors
Product specification
Octal bus transceiver with direction pin with 5-volt
tolerant inputs/outputs (3-State)
74LVC245A
74LVCH245A
TSSOP20: plastic thin shrink small outline package; 20 leads; body width 4.4 mm
SOT360-1
9
1998 May 20
Philips Semiconductors
Product specification
Octal bus transceiver with direction pin with 5-volt
tolerant inputs/outputs (3-State)
74LVC245A
74LVCH245A
Data sheet status
[1]
Data sheet
status
Product
status
Definition
Objective
specification
Development
This data sheet contains the design target or goal specifications for product development.
Specification may change in any manner without notice.
Preliminary
specification
Qualification
This data sheet contains preliminary data, and supplementary data will be published at a later date.
Philips Semiconductors reserves the right to make chages at any time without notice in order to
improve design and supply the best possible product.
Product
specification
Production
This data sheet contains final specifications. Philips Semiconductors reserves the right to make
changes at any time without notice in order to improve design and supply the best possible product.
[1] Please consult the most recently issued datasheet before initiating or completing a design.
Definitions
Short-form specification — The data in a short-form specification is extracted from a full data sheet with the same type number and title. For
detailed information see the relevant data sheet or data handbook.
Limiting values definition — Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one
or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or
at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended
periods may affect device reliability.
Application information — Applications that are described herein for any of these products are for illustrative purposes only. Philips
Semiconductors make no representation or warranty that such applications will be suitable for the specified use without further testing or
modification.
Disclaimers
Life support — These products are not designed for use in life support appliances, devices or systems where malfunction of these products can
reasonably be expected to result in personal injury. Philips Semiconductors customers using or selling these products for use in such applications
do so at their own risk and agree to fully indemnify Philips Semiconductors for any damages resulting from such application.
Righttomakechanges—PhilipsSemiconductorsreservestherighttomakechanges, withoutnotice, intheproducts, includingcircuits,standard
cells, and/or software, described or contained herein in order to improve design and/or performance. Philips Semiconductors assumes no
responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright, or mask work right to these
products, and makes no representations or warranties that these products are free from patent, copyright, or mask work right infringement, unless
otherwise specified.
Philips Semiconductors
811 East Arques Avenue
P.O. Box 3409
Copyright Philips Electronics North America Corporation 1998
All rights reserved. Printed in U.S.A.
Sunnyvale, California 94088–3409
Telephone 800-234-7381
print code
Date of release: 05-96
9397-750-04503
Document order number:
Philips
Semiconductors
相关型号：
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Octal bus transceiver with direction pin with 5-volt tolerant inputs/outputs 3-State
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