MC74F657A Datasheet PDF - Motorola


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MC74F657A
Motorola

Part Number MC74F657A
Description OCTAL BIDIRECTIONAL TRANSCEIVER
Page 5 Pages

MC74F657A datasheet pdf
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OCTAL BIDIRECTIONAL
TRANSCEIVER WITH 8-BIT PARITY
GENERATOR CHECKER
(3-STATE OUTPUTS)
The MC74F657A and MC74F657B are Octal Bidirectional Transceivers
with an 8-bit parity Generator/Checker and 3-state outputs.
The A and B options are faster versions of the F657 and contain eight non-
inverting buffers with 3-state outputs and an 8-bit parity generator/checker.
These devices are intended for bus-oriented applications. The buffers have
a guaranteed current sinking capability of 24 mA at the A ports and 64 mA at
the B ports. The Transmit/Receiver (T/R) input determines the direction of the
data flow through the bidirectional transceivers. Transmit (active HIGH) en-
ables data from A ports to B ports; Receive (active LOW) enables data from
B ports to A ports.
High-Impedance NPN Base Input for Reduced Loading (20 µA in
HIGH and LOW States)
Ideal in Applications Where High Output Drive and Light Bus Loading
are Required (IIL is 20 µA versus Fast std of 600 µA)
Combines F245 and F280A Functions in One Package
3-State Outputs
B Outputs, PARITY, ERROR, Sink 64 mA and Source 15 mA
15 mA Source Current
Input Diodes for Termination Effects
Glitchless Outputs During Power Up and Power Down
High Impedance Outputs During Power Off
ESD Protection > 4000 Volts
PIN ASSIGNMENT
OE B0 B1 B2 B3 GND GND B4 B5 B6 B7 PARITY
24 23 22 21 20 19 18 17 16 15 14 13
MC74F657A,B
OCTAL BIDIRECTIONAL
TRANSCEIVER WITH 8-BIT PARITY
GENERATOR CHECKER
(3-STATE OUTPUTS)
FASTSCHOTTKY TTL
24
1
J SUFFIX
CERAMIC
CASE 758-01
24
1
24
1
N SUFFIX
PLASTIC
CASE 724-03
DW SUFFIX
SOIC
CASE 751E-03
1 2 3 4 5 6 7 8 9 10 11 12
T/R A0 A1 A2 A3 A4 VCC A5 A6 A7 ODD/ ERROR
EVEN
LOGIC SYMBOL
2 3 4 5 6 8 9 10
A0 A1 A2 A3 A4 A5 A6 A7
1 T/R
24 OE
11 EVEN/ODD
PARITY
ERROR
13
12
B0 B1 B2 B3 B4 B5 B6 B7
23 22 21 20 17 16 15 14
FAST AND LS TTL DATA
4-247
ORDERING INFORMATION
MC74FXXXAJ/BJ
MC74FXXXAN/BN
MC74FXXXADW/BDW
Ceramic
Plastic
SOIC



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MC74F657A, B
GUARANTEED OPERATING RANGES
Symbol
Parameter
VCC
TA
Supply Voltage
Operating Ambient
Temperature Range
IOH Output Current — High
IOL Output Current — Low
FUNCTION TABLE
Number of
Inputs That are High
0, 2, 4, 6, 8
OE
L
L
L
L
L
L
Inputs
T/R Even/Odd
HH
HL
LH
LH
LL
LL
Min Typ
74 4.5 5.0
74 0 25
74
74
Input/Output
Parity
H
L
H
L
H
L
Error
Z
Z
H
L
L
H
Number of
Inputs That are High
Inputs
Input/Output
OE T/R
Even/Odd
Parity
1, 3, 5, 7
LH
LH
LL
LL
LL
LL
H
L
H
H
L
L
L
H
H
L
H
L
Don’t Care
HX
X
Z
H = HIGH Voltage Level; L = LOW Voltage Level; X = Don’t Care; Z = HIGH impedance state.
Error
Z
Z
L
H
H
L
Z
Max
5.5
70
–3.0/–15
24/64
Unit
V
°C
mA
mA
Outputs
Outputs Mode
Transmit
Transmit
Receive
Receive
Receive
Receive
Outputs
Outputs Mode
Transmit
Transmit
Receive
Receive
Receive
Receive
Z
FAST AND LS TTL DATA
4-248



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MC74F657A, B
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Symbol
Parameter
Min Typ Max Unit
Test Conditions
VIH
VIL
VIK
VOH
Input HIGH Voltage
2.0
Input LOW Voltage
0.8
Input Clamp Diode Voltage
–0.73 –1.2
All Outputs 74 2.4
Output HIGH Voltage
B0–B7
PARITY,
ERROR
2.7 3.4
74 2.0
V Guaranteed Input HIGH Voltage
V Guaranteed Input LOW Voltage
V VCC = MIN, IIN = –18 mA
VCC = 4.5 V
V IOH = –3.0 mA
VCC = 4.75 V
V IOH = –15 mA VCC = 4.5 V
VOL
Output LOW Voltage
A0–A7
B0–B7
PARITY,
ERROR
74
74
0.35 0.5
0.4 0.55
V IOL = 24 mA
VCC = MIN
V IOL = 64 mA
IIH Input HIGH Current
T/R, OE, EVEN/ODD
A0–A7
B0–B7, PARITY
EVEN/ODD
T/R, OE
100 µA VCC = 0 V, VIN = 7.0 V
2.0 VCC = 5.5 V, VIN = 5.5 V
mA
1.0 VCC = 5.5 V, VIN = 5.5 V
20
µA VCC = MAX, VIN = 2.7 V
40
IIL Input LOW Current
EVEN/ODD
T/R, OE
–20
–40 µA VCC = MAX, VIN = 0.5 V
IIH
+IOZH
IIL
+IOZL
IOZH
IOZL
Off-State Current HIGH
Level Voltage Applied
Off-State Current LOW
Level Voltage Applied
Off-State Output Current,
High-Level Voltage Applied
Off-State Output Current,
Low-Level Voltage Applied
A0–A7
B0–B7
PARITY
ERROR
70 VCC = MAX, VOUT = 2.7 V
µA
–70 VCC = MAX, VOUT = 0.5 V
50 VCC = MAX, VOUT = 2.7 V
µA
–50 VCC = MAX, VOUT = 0.5 V
IOS
Output Short Circuit
Current (Note 2)
An Outputs
PARITY, Bn Outputs,
ERROR
–60
–100
–150
–225 mA VCC = MAX, VOUT = 0 V
ICCH
90 135
ICC Total Supply Current
ICCL
106 150
mA VCC = MAX
ICCZ
98 145
NOTES:
1. For conditions shown as MIN or MAX, use appropriate value specified under recommended operating conditions for the applicable device type.
2. Not more than one output should be shorted at one time, nor for more than 1 second.
FAST AND LS TTL DATA
4-249



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F657A
AC ELECTRICAL CHARACTERISTICS
Symbol
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
Parameter
Propagation Delay
An to Bn or Bn to An
Propagation Delay
An to PARITY
Propagation Delay
EVEN/ODD to PARITY, ERROR
Propagation Delay
Bn to ERROR
Propagation Delay
PARITY to ERROR
Output Enable Time
to HIGH or LOW Level
Output Disable Time
from HIGH or LOW Level
F657B
AC ELECTRICAL CHARACTERISTICS
Symbol
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
Parameter
Propagation Delay
An to Bn or Bn to An
Propagation Delay
An to PARITY
Propagation Delay
EVEN/ODD to PARITY, ERROR
Propagation Delay
Bn to ERROR
Propagation Delay
PARITY to ERROR
Output Enable Time
to HIGH or LOW Level
Output Disable Time
from HIGH or LOW Level
MC74F657A, B
74F
TA = +25°C
VCC = +5.0 V
CL = 50 pF
Min Typ Max
2.0 7.0
2.0 7.0
6.0 13
6.5 13
4.5 10.5
4.5 10.5
7.0 18
7.0 18
8.0 14
7.0 14
3.0 8.0
4.0 9.0
2.0 7.5
2.0 6.0
74F
TA = 0°C to +70°C
VCC = +5.0 V ± 10%
CL = 50 pF
Min Max
2.0 7.5
2.0 7.5
5.5 14
6.5 14
4.5 11
4.5 11.5
6.5 19
6.5 19
7.0 15
7.0 15
3.0 9.0
4.0 10
2.0 8.0
2.0 6.5
Unit
ns
ns
ns
ns
ns
ns
ns
74F
TA = +25°C
VCC = +5.0 V
CL = 50 pF
Min Typ Max
2.0 6.0
2.0 6.0
4.5 11.5
4.5 11.5
2.0 7.5
2.0 7.5
4.0 15
4.0 15
5.0 11
5.0 11
2.0 7.0
2.0 7.0
2.0 6.0
2.0 6.0
74F
TA = 0°C to +70°C
VCC = +5.0 V ± 10%
CL = 50 pF
Min Max
2.0 6.5
2.0 6.5
4.5 13
4.5 13
2.0 8.5
2.0 8.5
3.5 16
3.5 16
4.0 12
4.0 12
2.0 8.0
2.0 8.0
2.0 6.5
2.0 6.5
Unit
ns
ns
ns
ns
ns
ns
ns
FAST AND LS TTL DATA
4-250




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