74F646 Datasheet, PDF (12/16 Pages) NXP Semiconductors – Octal transceiver/register, non-inverting 3-State

Philips Semiconductors
Transceivers/registers
Product specification
74F646/A/74F648/A
AC WAVEFORMS (Continued)
An or Bn
Bn or An
V_M
t_PLH
V_M
V_M
SBA or SAB
t_PHL
V_M
An or Bn
SF00396
Waveform 3. Propagation delay for An to Bn or Bn to An and
SAB or SBA to An or Bn
An or Bn
CPBA
or
CPAB
V_M
V_M
t_su(H) t_h(H)
V_M
V_M
t_su(L)
V_M
t_h(L)
V_M
Waveform 4. Data setup time and hold times
SF00397
OE
V_M
V_M
DIR
t_PZH
t_PHZ
V_OH -0.3V
An or Bn
V_M
0V
SF00398
Waveform 5. 3-state output enable time to high level and
output disable time from high level
OE
DIR
An or Bn
V_M
t_PZL
V_M
t_PLZ
V_M
3.5V
V_OL +0.3V
SF00399
Waveform 6. 3-state output enable time to low level and output
disable time from low level
NOTES:
1. For all waveforms, V_M = 1.5V.
2. The shaded areas indicate when the input is permitted to change for predictable output performance.
TEST CIRCUIT AND WAVEFORM
V_CC
V_IN
PULSE
GENERATOR
V_OUT
R_L
D.U.T.
R_T
C_L R_L
Test Circuit for Open Collector Outputs
SWITCH POSITION
TEST
t_PLZ
t_PZL
All other
SWITCH
closed
closed
open
7.0V
90%
NEGATIVE
PULSE
POSITIVE
PULSE
10%
t_w
V_M
10%
t_{THL (}t_f )
V_M
10%
t_{TLH (}t_r )
t_{TLH (}t_r )
90%
V_M
t_w
t_{THL (}t_f )
90%
V_M
Input Pulse Definition
90%
AMP (V)
0V
AMP (V)
10%
0V
DEFINITIONS:
R_L = Load resistor;
see AC electrical characteristics for value.
C_L = Load capacitance includes jig and probe capacitance;
see AC electrical characteristics for value.
R_T = Termination resistance should be equal to Z_OUT of
pulse generators.
INPUT PULSE REQUIREMENTS
family
amplitude ^VM rep. rate
t_w
t_TLH
74F
3.0V 1.5V 1MHz 500ns 2.5ns
t_THL
2.5ns
SF00128
1990 Sep 25
12