Philips Semiconductors

Product specification

74F657

Octal transceiver with 8-bit parity generator/checker

90 July 30

6

DC ELECTRICAL CHARACTERISTICS

(Over recommended operating free-air temperature range unless otherwise noted.)

SYMBOL

PARAMETER

TEST

LIMITS

UNIT

MIN

MAX

All outputs

2.4

V

2.7

V

High-level output voltage

B0 – B7,

2.0

V

PARITY,

2.0

V

ERROR

2.0

V

2.0

V

A0 – A7

0.35

0.50

V

0.35

0.50

V

Low-level output voltage

B0 – B7,

0.38

0.55

V

PARITY,

0.42

0.55

V

ERROR

0.42

0.55

V

Input clamp voltage

–0.73

-1.2

V

Input current at

OE, T/R,

ODD/EVEN

100

µA

maximum input voltage

A0 – A7

2

mA

B0 – B7

1

mA

OOD/EVEN

µA

High–level input current

µA

OE, T/R

µA

µA

Low–level input current

OOD/EVEN

–20

µA

OE, T/R

–40

µA

Off–state output current,

high–level voltage applied

A0 – A7,

B0 – B7,

70

µA

Off–state output current,

low–level voltage applied

PARITY

–70

µA

Off–state output current,

High–level voltage applied

ERROR

50

µA

Off–state output current,

low–level voltage applied

–50

µA

A0 – A7

-60

-150

mA

B0 – B7

-100

-225

mA

90

mA

90

mA

Supply current (total)

106

mA

106

mA

98

145

mA

Notes to DC electrical characteristics

1. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions for the applicable type.

techniques are preferable in order to minimize internal heating and more accurately reflect operational values. Otherwise, prolonged shorting

of a high output may raise the chip temperature well above normal and thereby cause invalid readings in other parameter tests. In any

4. For commercial range.

5. For industrial range.