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© Koninklijke Philips Electronics N.V. 2004. All rights reserved.

Product data sheet

Rev. 03 — 12 November 2004

11 of 17

Philips Semiconductors

74HC243

Quad bus transceiver; 3-state

Fig 7.

Waveforms showing the 3-state enable and disable times for input OEB

Test data is given in Table 9.

Definitions for test circuit:

generator.

Fig 8.

Load circuitry for switching times

Table 9:

Test data

Supply

Input

Load

2.0 V

6 ns

50 pF

1 k

Ω

GND

open

4.5 V

6 ns

50 pF

1 k

Ω

GND

open

6.0 V

6 ns

50 pF

1 k

Ω

GND

open

5.0 V

6 ns

15 pF

1 k

Ω

GND

open

OEB input

output

LOW to OFF

OFF to LOW

output

HIGH to OFF

OFF to HIGH

001aab956

90 %

10 %

10 %

90 %

outputs

disabled

outputs

enabled

outputs

enabled

open

GND

mna232

D.U.T.

CL

RL =

1000

Ω

PULSE

GENERATOR