74F657 Datasheet, PDF (5/12 Pages) NXP Semiconductors – Octal transceiver with 8-bit parit generator/checker

Philips Semiconductors
Octal transceiver with 8-bit parity generator/checker
Product specification
74F657
FUNCTION TABLE
NUMBER OF INPUTS THAT ARE HIGH
0, 2, 4, 6, 8
1, 3, 5, 7
Don’t care
Notes to function table
1. H = High voltage level
2. L = Low voltage level
3. X = Don’t care
4. Z = High impedance ”’off” state
INPUTS
OE T/R ODD/EVEN
LH
H
LH
L
LL
H
LL
H
LL
L
LL
L
LH
H
LH
L
LL
H
LL
H
LL
L
LL
L
HX
X
INPUT/OUTPUT
PARITY
H
L
H
L
H
L
L
H
H
L
H
L
Z
ERROR
Z
Z
H
L
L
H
Z
Z
L
H
H
L
Z
OUTPUTS
OUTPUTS MODE
Transmit
Transmit
Receive
Receive
Receive
Receive
Transmit
Transmit
Receive
Receive
Receive
Receive
Z
ABSOLUTE MAXIMUM RATINGS
(Operation beyond the limit set forth in this table may impair the useful life of the device. Unless otherwise noted these limits are over the
operating free air temperature range.)
SYMBOL
PARAMETER
RATING
UNIT
V_CC
V_IN
I_IN
V_OUT
Supply voltage
Input voltage
Input current
Voltage applied to output in high output state
–0.5 to +7.0
V
–0.5 to +7.0
V
–30 to +5
mA
–0.5 to V_CC
V
I_OUT
Current applied to output in low output state
A0 – A7
48
mA
B0 – B7, PARITY, ERROR
128
mA
T_amb
T_stg
Operating free air temperature range
Storage temperature range
Commercial range
Industrial range
0 to +70
°C
–40 to +85
°C
–65 to +150
°C
RECOMMENDED OPERATING CONDITIONS
SYMBOL
PARAMETER
V_CC
Supply voltage
V_IH
High–level input voltage
V_IL
Low–level input voltage
I_Ik
Input clamp current
I_OH
High–level output current
I_OL
Low–level output current
T_amb
Operating free air temperature range
LIMITS
UNIT
MIN
NOM
MAX
4.5
5.0
5.5
V
2.0
V
0.8
V
–18
mA
A0 – A7
–3
mA
B0 – B7, PARITY, ERROR
–15
mA
A0 – A7
24
mA
B0 – B7, PARITY, ERROR
64
mA
Commercial range
0
+70
°C
Industrial range
–40
+85
°C
90 July 30
5