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參數(shù)資料
| 型號(hào)： | MC74F657BN |
| 廠商： | MOTOROLA INC |
| 元件分類： | 通用總線功能 |
| 英文描述： | OCTAL BIDIRECTIONAL TRANSCEIVER WITH 8-BIT PARITY GENERATOR CHECKER (3-STATE OUTPUTS) |
| 中文描述： | F/FAST SERIES, 8-BIT TRANSCEIVER, TRUE OUTPUT, PDIP24 |
| 封裝： | 724-03 |
| 文件頁(yè)數(shù)： | 1/5頁(yè) |
| 文件大小： | 135K |
| 代理商： | MC74F657BN |
4-247
FAST AND LS TTL DATA
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
μ
A in
HIGH and LOW States)
Ideal in Applications Where High Output Drive and Light Bus Loading
are Required (IIL is 20
μ
A versus Fast std of 600
μ
A)
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
22
21
20
19
18
17
1
2
3
4
A2
5
A3
6
A4
7
24
23
8
OE
T/R
B0
B1
B2
B3
GND
GND
B4
A0
A1
VCC
A5
9
10
A7
11
12
A6
ERROR
16
15
14
13
B5
B7
B6
PARITY
ODD/
EVEN
LOGIC SYMBOL
OE
EVEN/ODD
PARITY
ERROR
T/R
B0
B1
B2
B3
B4
B5
B6
B7
24
11
1
23
22
21
20
17
16
15
14
13
12
A0
A1
A2
A3
A4
A5
A6
A7
2
3
4
5
6
8
9
10
MC74F657A,B
OCTAL BIDIRECTIONAL
TRANSCEIVER WITH 8-BIT PARITY
GENERATOR CHECKER
(3-STATE OUTPUTS)
FAST
SCHOTTKY TTL
ORDERING INFORMATION
MC74FXXXAJ/BJ
MC74FXXXAN/BN
MC74FXXXADW/BDW
Ceramic
Plastic
SOIC
N SUFFIX
PLASTIC
CASE 724-03
DW SUFFIX
SOIC
CASE 751E-03
24
1
24
1
J SUFFIX
CERAMIC
CASE 758-01
24
1
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