Datasheet

SN74F657
OCTAL TRANSCEIVER WITH PARITY GENERATOR/CHECKER
AND 3-STATE OUTPUTS
SDFS027A – D3217, JANUARY 1989 – REVISED OCTOBER 1993
2–2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
FUNCTION TABLE
NUMBER OF A OR B
INPUTS
INPUT/OUTPUT
OUTPUTS
INPUTS THAT ARE HIGH
OE T/R ODD/EVEN
PARITY
ERR OUTPUT MODE
L H H H Z Transmit
L HL L ZTransmit
02468
L LH H HReceive
0
,
2
,
4
,
6
,
8
L LH L LReceive
L LL H LReceive
L LL L HReceive
L H H L Z Transmit
L HL H ZTransmit
1357
L LH H LReceive
1
,
3
,
5
,
7
L LH L HReceive
L LL H HReceive
L LL L LReceive
Don’t care H X X Z Z Z
logic symbol
†
B2
22
B3
21
B4
20
B5
17
B6
16
B1
23
OE
T/R
3 EN1/3G5 [REC]
1
A2
3
A3
4
A4
5
A5
6
A6
8
A7
9
A8
10
B7
15
B8
14
ODD/EVEN
3 EN2 [XMIT]
1
2
2 k
5
4
, 2
4
, 1
ERR
Z11
1
G3
24
N4
11
11
A1
2
12
13
14
15
16
17
18
PARITY
13
12
†
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.