MC74F657B 반도체 회로 부품 판매점
OCTAL BIDIRECTIONAL TRANSCEIVER
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 Motorola Semiconductors |
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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)
FAST™ SCHOTTKY 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
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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( motorola )
MC74F657B transceiver
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국내 전력반도체 판매점
상호 : 아이지 인터내셔날
전화번호 : 051-319-2877
[ 홈페이지 ]
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관련 데이터시트
MC74F657A
OCTAL BIDIRECTIONAL TRANSCEIVER - Motorola Semiconductors
MC74F657B
OCTAL BIDIRECTIONAL TRANSCEIVER - Motorola Semiconductors