MC74F3893A [MOTOROLA]
QUAD FUTUREBUS BACKPLANE TRANSCEIVER; 四FUTUREBUS背板收发器
| 型号： | MC74F3893A |
| 厂家： | 
MOTOROLA |
| 描述： | QUAD FUTUREBUS BACKPLANE TRANSCEIVER |
| 文件： | 总5页 (文件大小：38K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MC74F3893A
QUAD FUTUREBUS
BACKPLANE TRANSCEIVER
(3 STATE + OPEN COLLECTOR)
QUAD FUTUREBUS
BACKPLANE TRANSCEIVER
(3 STATE + OPEN COLLECTOR)
The MC74F3893A is a quad backplane transceiver and is intended to be
used in very high speed bus systems.
The MC74F3893A interfaces to “Backplane Transceiver Logic” (BTL). BTL
features a reduced (1 V) voltage swing for lower power consumption and a se-
ries diode on the drivers to reduce capacitive loading (< 5 pF).
Incidentwave switching is employed, therefore BTL propagation delays are
short. Although the voltage swing is much less for BTL, so is its receiver
threshold region, therefore noise margins are excellent.
FAST SCHOTTKY TTL
BTL offers low power consumption, low ground bounce, reduced EMI and
crosstalk, low capacitive loading, superior noise margin and short propaga-
tion delays. This results in a high bandwidth, reliable backplane.
FN SUFFIX
PLASTIC
CASE 775-02
The MC74F3893A has four TTL outputs (R ) on the receiver side with a
n
commonReceiveEnableinput(RE).Ithasfourdatainputs(D )whicharealso
n
8
19
TTL. ThesedatainputsareNANDedwiththeDataEnableinput(DE). Thefour
I/O pins (Bus side) are futurebus compatible, sink a minimum of 100 mA, and
are designed to drive heavily loaded backplanes with load impedances as low
as 10 ohms. All outputs are designed to be glitch-free during power up and
power down.
4
3
ORDERING INFORMATION
MC74FXXXXAFN
Plastic
• Quad Backplane Transceiver
• Drives Heavily Loaded Backplanes with Equivalent Load Impedances
Down to 10 ohms
• Futurebus Drivers Sink 100 mA
LOGIC SYMBOL
• Reduced Voltage Swing (1 Volt) Produces Less Noise and Reduces
Power Consumption
2
4
7
9
• High Speed Operation Enhances Performance of Backplane Buses
and Facilitates Incident Wave Switching
D
D
D
D
3
0
1
2
11
12
DE
RE
• Compatible with IEEE 896 and IEEE 1194.1 Futurebus Standards
• Built-In Precision Band-Gap (BG) Reference Provides Accurate Re-
ceiver Threshold and Improved Noise Immunity
• Glitch-Free Power Up/Power Down Operation On All Outputs
• Pin and Function Compatible with NSC DS3893A and Signetics
74F3893
I/O
I/O
I/O
I/O
R
R
R
R
3
0
1
2
3
0
1
2
18 17 15
14
3
5
8
10
• Separate Bus Ground Returns for Each Driver to Minimize Ground
Noise
• MOS and TTL Compatible High Impedance Inputs
PINOUT: 20-LEAD PLCC (TOP VIEW)
BUS
GND
I/O
I/O
I/O
I/O
3
0
1
2
18
17
16
15
14
BUS
GND
BUS
GND
19
13
BG
GND
20
1
12
11
10
9
RE
DE
V
CC
D
2
R
D
0
0
3
R
3
3
4
5
6
7
8
D
R
LOGIC
GND
D
R
2
1
1
2
FAST AND LS TTL DATA
4-273
MC74F3893A
LOGIC DIAGRAM
2
D
R
D
18
17
0
0
1
I/O
I/O
0
3
4
5
1
R
1
2
12
15
RE
7
8
9
D
I/O
2
R
D
R
2
3
3
14
I/O
3
10
11
DE
V
= PIN 1: LOGIC GND = PIN 6
CC
BUS GND = PIN 13,16, 19: BG GND = PIN 20
FUNCTION TABLE
Inputs
Input/Output
Outputs
DE
RE
D
I/O
R
n
Operating Mode
Transmit to Bus
n
n
H
H
L
L
L
H
H
L
L
H
H
L
H
H
L
H
D
H
Z
Z
Receiver 3-State,
Transmit to Bus
n
L
L
L
L
X
X
H
L
L
H
Receive, I/O = Inputs
n
H = HIGH voltage level:
L = LOW voltage level:
X = Don’t care:
Z = HIGH impedance “Off” state.
RECOMMENDED OPERATING CONDITIONS
Limits
Typ
5.0
—
Symbol
Parameter
Min
Max
5.5
Unit
V
V
CC
Supply Voltage
4.5
2.0
—
V
IH
High-Level Input Voltage
Low-Level Input Voltage
Input Clamp Current
Bus Input Threshold
—
V
D , DE, RE
n
V
IL
—
0.8
V
I
IK
—
—
–18
1.625
–3.0
100
70
mA
V
V
TH
I/O Only
1.475
—
1.550
—
n
I
Output Current
Output Current
High
Low
R
Only
mA
mA
°C
OH
n
I
—
—
OL
T
A
Operating Ambient Temperature Range
0
—
FAST AND LS TTL DATA
4-274
MC74F3893A
DC CHARACTERISTICS (Over Recommended Operating Free-Air Temperature Range Unless otherwise specified)
Limits
Test Conditions
(Note 1)
Min
Typ (2)
Max
Symbol
Parameter
Unit
V
I
= MIN: V = 1.3 V; RE = 0.8 V:
IL
= MAX
CC
OH
V
OH
High-Level Output Voltage
R
2.5
—
—
V
n
V
V
= MAX: DN = DE = 0.8 V:
CC
T
= 2.0 V: R = 10Ω: RE = 2.0 V
V
High-Level Output Bus Voltage
I/O
1.9
—
—
—
V
T
OHB
n
I
= MAX
OH
V
= MIN: V = 1.8 V; RE = 0.8 V: I =
IN OL
CC
6.0 mA
V
OL
Output LOW Voltage
R
0.35
0.5
V
V
n
0.75
0.75
1.0
1.0
1.2
1.1
D
D
V
= DE = V : I
IH OL
= 100 mA
= 80 mA
n
V
Low Level Output Bus Voltage
I/O
OLB
OCB
n
n
= DE = V : I
IH OL
n
= MAX or 0 V: DN =
—
—
—
—
2.9
3.2
I/O = 1.0 mA
n
CC
Driver Output Positive
Clamp Voltage
DE = 0.8 V:
RE = 2.0 V
V
I/O
V
I/O = 10 mA
n
V
Input Clamp Diode Voltage
—
—
—
–0.73
—
–1.2
100
20
V
V
= MIN, I = I
IK
IK
CC
I
I
Input Current at Maximum Input Voltage
µA
µA
V
CC
=MAX:V =7.0V:DE=RE=D =V
I n CC
I
I
IH
High Level Input Current
D , RE, DE
—
V
= MAX: DE = RE = D = 2.5 V
n
n
CC
CC
High-Level I/O Bus Current
(Power Off)
V
= 0 V: DN = DE = 0.8 V:
I
I/O
—
—
100
µA
IHB
n
I/O
n = 1.2 V:
RE = 0 V:
RE
—
—
—
—
—
—
–100
–200
–500
V
= MAX:
DE = 4.5 V
D = 4.5 V
n
CC
D
n
µA
I
IL
Low-Level Input Current
DE
V = 0.5V:
I
Low-Level I/O Bus Current
(Power On)
V
= MAX: D = DE = 0.8 V:
n
CC
I/O = 0.75 V : RE = 0 V:
I
I/O
–250
—
—
—
—
100
20
µA
µA
ILB
n
n
Off-State Output Current, High-
Level Voltage Applied
V
O
= 2.5V:
I
OZH
RE = 2.0 V
Off-State Output Current,
Low-Level Voltage Applied
V
V
= MAX:
CC
= 0.5 V: RE = 2.0 V
R
V
CC
= MAX:
I
—
–20
n
OZL
O
Output Short Circuit Current
(Note 3)
D = 1.2 V: V = 0 V: RE
n O
I
I
–80
—
—
–200
80
mA
mA
OS
= 0.8 V
Supply Current (Total )
55
V = MAX: (RE = V or V )
CC IH IL
CC
NOTES:
1. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions for the applicable device type.
2. All typical values are at V = 5.0 V, T = + 25°C.
CC
A
3. Not more than one output should be shorted at a time. For testing I , the use of high-speed test apparatus and/or sample-and-hold techniques are prefer-
OS
able in order to minimize internal heating and more accurately reflect operational values. Otherwise, prolonged shorting of a High output may raise the chip
temperature well above normal and thereby cause invalid readings in other parameter tests. In any sequence of parameter tests, I
performed last.
tests should be
OS
FAST AND LS TTL DATA
4-275
MC74F3893A
AC ELECTRICAL CHARACTERISTICS for Receiver and Receiver Enable
74F
74F
T
= +25°C
T
= 0°C to +70°C
A
A
V
CC
=+5.0V, V =+2.0V
C
R
V
=+5.0V ±10%,V =+2.0V
CC T
T
= 30 pF
C
= 30 pF
D
D
= 10 Ω
R
= 10 Ω
T
T
Min
Typ
Max
Min
Max
Symbol
Parameter
Propagation Delay
Unit
t
t
—
—
—
—
—
—
1.0
1.0
7.0
7.0
PLH
PHL
ns
D
to I/O
n
n
t
t
Propagation Delay
DE to I/O
—
—
—
—
—
—
1.0
1.0
7.0
7.0
PLH
PHL
ns
n
t
t
D
to I/O Transition Time
—
—
—
—
—
—
1.0
1.0
5.0
5.0
TLH
THL
n
n
ns
ns
10% to 90%, 90% to 10%
t
Skew Between Receivers in Same Package
—
1.0
—
—
—
Dskew
AC ELECTRICAL CHARACTERISTICS for Receiver
74F
74F
T
= +25°C
T
V
= 0°C to +70°C
A
A
V
C
=+5.0V
= 50 pF
= 1.0K Ω
=+5.0V ±10%
CC
CC
C
= 50 pF
L
L
R
R
= 1.0K Ω
L
L
Min
Typ
Max
Min
Max
Symbol
Parameter
Propagation Delay
Unit
ns
t
t
—
—
—
—
—
—
2.0
2.0
8.0
8.0
PLH
PHL
I/O to R
n
n
t
Skew Between Receivers in Same Package
—
1.0
—
—
—
ns
Dskew
AC ELECTRICAL CHARACTERISTICS for Receiver Enable
74F
74F
T
= +25°C
=+5.0V
= 50 pF
= 500 Ω
T
V
= 0°C to +70°C
A
A
V
C
=+5.0V ±10%
CC
CC
C
= 50 pF
L
L
L
L
R
R
= 500 Ω
Min
Typ
Max
Min
Max
Symbol
Parameter
Unit
t
t
Output Enable to High or Low Level
—
—
—
—
—
—
2.0
2.0
12.0
12.0
PZH
PZL
ns
RE to R
n
t
t
Output Disable From High or Low Level
RE to R
—
—
—
—
—
—
1.0
1.0
8.0
8.0
PHZ
PLZ
ns
n
FAST AND LS TTL DATA
4-276
FAST AND LS TTL DATA
4-277
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