74ABT657D Philips Semiconductors, 74ABT657D Datasheet - Page 7

• Manufacturer Part Number: 74ABT657D
• Description: Octal transceiver with parity generator/checker 3-State
• Manufacturer: Philips Semiconductors

1. These delay times reflect the 3-State recovery time only and do not include the delay through the buffers and the parity check circuitry which
Philips Semiconductors
AC CHARACTERISTICS
GND = 0V; t
NOTES:
AC WAVEFORMS
NOTE: For all waveforms, V
1995 Dec 11
SYMBOL
Octal transceiver with parity generator/checker
(3-State)
Waveform 3. 3-State Output Enable Time to High Level and
affect the ERROR output. To assure valid information at the ERROR pin, time must be allowed for the signal to propagate through the
drivers (B to A), through the parity check circuitry (same as A to PARITY), and to the ERROR output. Valid data at the ERROR pin
+ (A to PARITY).
t
t
t
t
t
t
t
t
t
t
t
t
t
t
PLH
PHL
PLH
PHL
PLH
PHL
PLH
PHL
PLH
PHL
PZH
PHZ
PZL
PLZ
PARITY, ERROR
Waveform 1. Propagation Delay For Inverting Output
ODD/EVEN
ODD/EVEN
PARITY,
PARITY,
R
PARITY
PARITY
ERROR
ERROR
An, Bn
An, Bn
An, Bn
= t
Output Disable Time from High Level
Propagation delay
An to Bn or Bn to An
Propagation delay
An to PARITY
Propagation delay
ODD/EVEN 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
OE
F
= 2.5ns; C
V
PARAMETER
M
M
t
L
V
V
PZH
M
M
= 1.5V.
t
t
= 50pF, R
PHL
PHL
1
V
M
V
V
V
M
M
L
M
V
V
= 500
M
M
t
PHZ
t
t
PLH
PLH
V
V
M
M
WAVEFORMS
V
OH
SA00219
SA00221
–0.3V
0V
1, 2
1, 2
1, 2
1, 2
3, 4
3, 4
2
7
Min
Waveform 4. 3-State Output Enable Time to Low Level and
1.1
1.2
2.5
2.8
1.7
1.9
3.9
4.0
2.7
3.2
1.3
1.9
2.4
2.7
Waveform 2. Propagation Delay For Non-Inverting Output
PARITY, ERROR
ODD/EVEN
T
PARITY,
ERROR
PARITY
V
An, Bn,
amb
An, Bn
CC
An, Bn
Output Disable Time from Low Level
Typ
3.3
3.0
6.5
7.0
5.0
5.0
9.2
9.6
6.0
6.4
3.8
4.4
5.1
5.4
= +5.0V
= +25
OE
o
C
LIMITS
Max
11.7
12.1
V
V
5.0
4.3
8.7
9.1
6.6
6.6
7.6
8.0
5.6
7.0
7.0
7.6
M
t
M
t
PLH
PZL
T
V
V
V
amb
M
M
Min
CC
V
1.1
1.2
2.5
2.8
1.7
1.9
3.9
4.0
2.7
3.2
1.3
1.9
2.4
2.7
V
M
M
= –40 to +85
= +5.0V 10%
74ABT657
t
t
PLZ
Product specification
PHL
V
M
Max
10.1
10.6
13.8
14.5
5.5
4.8
7.3
7.3
9.4
9.4
6.6
8.2
7.6
8.1
o
C
V
SA00222
OL
SA00220
(B to A)
UNIT
+0.3V
0V
ns
ns
ns
ns
ns
ns
ns