74LVC27DB datasheet(5/10 Pages) PHILIPS

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Philips Semiconductors

Product specification

74LVC27

Triple 3-input NOR gate

1998 Apr 28

AC CHARACTERISTICS

GND = 0 V; tr = tf v 2.5 ns; CL = 50 pF; RL = 500W; Tamb = –40_C to +85_C

LIMITS

SYMBOL

PARAMETER

WAVEFORM

VCC = 3.3V ±0.3V

VCC = 2.7V

UNIT

MIN

TYP1

MAX

MIN

MAX

tPHL/

tPLH

Propagation delay

nA, nB, nC to nY

Figure 1, 2

–

3.4

5.9

–

7.0

NOTE:

1. These typical values are at VCC = 3.3V and Tamb = 25°C.

AC WAVEFORMS

VM = 1.5 V at VCC w 2.7 V

VM = 0.5 S VCC at VCC < 2.7 V

VOL and VOH are the typical output voltage drop that occur with the

output load.

SV00420

nA, nB, nC

INPUT

nY OUTPUT

t PLH

t PHL

GND

VOL

VOH

Figure 1. Input (nA, nB, nC) to output (nY) propagation delays.

TEST CIRCUIT

SWITCH POSITION

PULSE

GENERATOR

D.U.T.

VCC

500

Ω

Open

GND

VCC

< 2.7V

VCC

TEST

tPLH/tPHL

Open

2.7V

2.7–3.6V

50pF

500

Ω

2 * VCC

SV00903

Figure 2. Load circuitry for switching times.

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