74F657 Datasheet, PDF (7/12 Pages) NXP Semiconductors – Octal transceiver with 8-bit parit generator/checker

Philips Semiconductors
Octal transceiver with 8-bit parity generator/checker
Product specification
74F657
AC ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
TEST
CONDITION
T_amb = +25°C
V_CC = +5.0V
C_L = 50pF,
R_L = 500Ω
MIN TYP MAX
LIMITS
T_amb = 0°C to +70°C
V_CC = +5.0V ± 10%
C_L = 50pF,
R_L = 500Ω
MIN
MAX
T_amb = –40°C to +85°C
V_CC = +5.0V ± 10%
C_L = 50pF,
R_L = 500Ω
MIN
MAX
UNIT
t_PLH
t_PHL
Propagation delay
An to Bn or Bn to An
Waveform 2
2.5
3.0
5.5
6.0
7.5
7.5
2.5
3.0
8.0
8.0
2.0
2.5
9.0
9.0
ns
t_PLH
Propagation delay
t_PHL
An to PARITY
Waveform 1, 2
7.0
7.0
10.0 14.0
10.0 15.0
7.0
7.0
16.0
16.0
5.5
6.5
16.5
19.0
ns
t_PLH
Propagation delay
4.5 7.5 11.0
4.5
12.0
3.5
13.0
t_PHL
ODD/EVEN to PARITY, Waveform 1, 2 4.5 8.0 11.5
4.5
12.5
4.0
15.5
ns
ERROR
t_PLH
Propagation delay
t_PHL
Bn to ERROR
Waveform 1, 2
8.0
8.0
14.0 20.5
14.0 20.5
7.5
7.5
22.5
22.5
7.5
7.5
24.5
25.0
ns
t_PLH
t_PHL
Propagation delay
PARITY to ERROR
Waveform 1, 2
8.0
8.0
11.5 15.5
12.0 15.5
7.5
8.0
16.5
17.0
6.5
6.5
18.5
20.0
ns
t_PZH
t_PZL
Output enable time¹
to high or low level
Waveform 3, 4
3.0
4.0
5.5
7.0
8.0
9.5
3.0
4.0
9.0
11.0
2.0
4.0
9.0
13.0
ns
t_PHZ
t_PLZ
Output disable time
from high or low level
Waveform 3, 4
2.0
2.0
4.5
4.0
7.5
6.0
2.0
2.0
8.0
6.5
1.0
1.0
8.0
7.5
ns
Note to AC electrical characteristics
1. These delay times reflect the 3-state recovery time only and not the signal through the buffers or the parity check circuitry. 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 > (B to A) + (A to PARITY).
AC WAVEFORMS
An, Bn,
ODD/EVEN,
PARITY
PARITY,
ERROR
V_M
t_PHL
V_M
t_PLH
V_M
V_M
SF00418
Waveform 1. Propagation delay for inverting outputs
An, Bn,
ODD/EVEN,
PARITY
A_n, B_n,
PARITY,
ERROR
V_M
V_M
t_PLH
t_PHL
V_M
V_M
SF00420
Waveform 2. Propagation delay for non-Inverting outputs
Note to AC waveforms
1. For all waveforms, V_M = 1.5V.
OE
V_M
V_M
An, Bn,
PARITY,
ERROR
t_PZH
t_PHZ
V_M
V_OH -0.3V
0V
SF00419
Waveform 3. 3-state output enable time to high level and output
disable time from high level
OE
V_M
V_M
An, Bn,
PARITY,
ERROR
t_PZL
t_PLZ
V_M
3.5V
V_OL +0.3V
SF00421
Waveform 4. 3-state output enable time to low level and output
disable time from low level
90 July 30
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