74HC245 Datasheet, PDF (13/22 Pages) NXP Semiconductors – Octal bus transceiver; 3-state

Philips Semiconductors
12. Waveforms
74HC245; 74HCT245
Octal bus tranceiver; 3-state
V_I
An, Bn input
GND
V_OH
Bn, An output
V_OL
V_M
t _PHL
V_M
t _THL
V_M
VM
10 %
t _PLH
90 %
t _TLH
001aac433
Fig 5.
Measurement points are given in Table 11.
V_OL and V_OH are typical voltage output drop that occur with the output load.
Input (An, Bn) to output (Bn, An) propagation delays and output transition times
V_I
OE input
10 %
GND
output ^VCC
LOW-to-OFF
OFF-to-LOW
V_OL
output ^VOH
HIGH-to-OFF
OFF-to-HIGH
GND
t_r
90 %
V_M
t_PLZ
t_PHZ
outputs
enabled
10 %
90 %
t_f
t_PZL
V_M
t_PZH
outputs
disabled
V_M
outputs
enabled
001aac479
Fig 6.
Measurement points are given in Table 11.
V_OL and V_OH are typical voltage output drop that occur with the output load.
3-state output enable and disable times
Table 11: Measurement points
Type
Input
74HC245
74HCT245
V_M
0.5V_CC
1.3 V
Output
V_M
0.5V_CC
1.3 V
9397 750 14502
Product data sheet
Rev. 03 — 31 January 2005
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
13 of 22