74F456 Datasheet, PDF (8/12 Pages) NXP Semiconductors – Buffers/drivers

Philips Semiconductors
Buffers/Drivers
Product specification
74F455,* 74F456
AC WAVEFORMS
For all waveforms, V_M = 1.5V.
Dn
SE, SO, Qn
V_M
V_M
t_PLH
t_PHL
V_M
V_M
SF00965
Waveform 1. Propagation Delay, Non-Inverting Outputs
OEn
SE, SO, Qn, Qn
V_M
t_PZH
V_M
t_PHZ
V_M
V_OH -0.3V
0V
SF00967
Waveform 3. 3-State Output Enable Time to High Level and
Output Disable Time from High Level
Dn
SE, SO, Qn
V_M
V_M
t_PHL
t_PLH
V_M
V_M
SF00966
Waveform 2. Propagation Delay, Inverting Outputs
OEn
V_M
V_M
t_PZL
t_PLZ
SE, SO, Qn, Qn
V_M
V_OL +0.3V
SF00968
Waveform 4. 3-State Output Enable Time to Low Level and
Output Disable Time from Low Level
TEST CIRCUIT AND WAVEFORMS
V_CC
V_IN
PULSE
GENERATOR
V_OUT
R_L
D.U.T.
R_T
C_L R_L
Test Circuit for 3-State 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
SF00777
* Discontinued part. Please see the Discontinued Products List.
1999 Jan 08
8