74HC243N Datasheet, PDF (11/17 Pages) NXP Semiconductors – Quad bus transceiver; 3-state

Philips Semiconductors
74HC243
Quad bus transceiver; 3-state
OEB input
output
LOW to OFF
OFF to LOW
output
HIGH to OFF
OFF to HIGH
t_r
90 %
V_M
10 %
t_PLZ
t_f
t_PZL
t_PHZ
10 %
90 %
V_M
t_PZH
V_M
outputs
enabled
outputs
disabled
outputs
enabled
001aab956
V_M = 0.5 × V_I.
Fig 7. Waveforms showing the 3-state enable and disable times for input OEB
V_I
PULSE
GENERATOR
V_CC
V_O
D.U.T.
R_T
S₁
RL ₌
1000 Ω
CL
mna232
V_CC
open
GND
Test data is given in Table 9.
Definitions for test circuit:
R_L = Load resistor.
C_L = Load capacitance including jig and probe capacitance.
R_T = Termination resistance should be equal to the output impedance Z_o of the pulse
generator.
Fig 8. Load circuitry for switching times
Table 9:
Supply
V_CC
2.0 V
4.5 V
6.0 V
5.0 V
Test data
Input
V_I
V_CC
V_CC
V_CC
V_CC
t_r = t_f
6 ns
6 ns
6 ns
6 ns
Load
C_L
50 pF
50 pF
50 pF
15 pF
R_L
1 kΩ
1 kΩ
1 kΩ
1 kΩ
S₁
t_PZL, t_PLZ
V_CC
V_CC
V_CC
V_CC
t_PZH, t_PHZ
GND
GND
GND
GND
t_PHL, t_PLH
open
open
open
open
9397 750 13808
Product data sheet
Rev. 03 — 12 November 2004
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
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