GTL2000 datasheet(2/6 Pages) PHILIPS

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Philips Semiconductors

Product specification

GTL2000

22-bit GTL processor voltage clamp

2000 Jan 25

853-2154 23030

FEATURES

• Direct interface with TTL level

• 6.5Ω ON-state connection between port S

n and Dn

DESCRIPTION

The GTL2000 provides twenty-two bits of high-speed voltage

clamps. The low ON-state resistance of the clamp allows

connections to be made with minimal propagation delay.

The device is organized as one 22-bit voltage clamp. When S or D

is low the clamp is in the ON–state and a low resistance connection

exists between the S and D ports. When S port and D port are high,

the clamp is in the OFF-state and a very high impedance exists

between the S and D ports. When the D port is high, the voltage on

the S port is clamped to the applied reference voltage on the GREF

port.

FUNCTION TABLE

GREF

DREF

SREF4

Switch

Driven

Input

Output of

Driven Input

0 V

off

VTT

VTT1

VTT

nearly off

VTT

0 – VTT

off

H = High voltage level

= Low voltage level

X = Don’t Care

NOTES:

1. The output is not pulled up or pulled down.

2. The output is pulled up to VCC through an external resistor.

3. The driven output can be Sn or Dn; the output of drivn input

follows the input low.

4. GREF must be at least 1.5 V higher than SREF for proper switch

operation.

PIN CONFIGURATION

SREF

S10

S11

S12

S13

S14

S15

S16

S17

S18

S19

S20

S21

S22

GREF

DREF

GND

D10

D11

D12

D13

D14

D15

D16

D17

D18

D19

D20

D21

D22

SA00521

QUICK REFERENCE DATA

SYMBOL

PARAMETER

CONDITIONS

Tamb = 25°C; GND = 0V

TYPICAL

UNIT

tPLH

Propagation delay

Sn to Dn

VDD1 = 3.3 V; VDD2 = 2.5 V;

VREF = 1.5 V; unloaded

1.5

COFF

Channel capacitance (OFF-state)

VS = 1.5 V

7.5

ORDERING INFORMATION

PACKAGES

TEMPERATURE RANGE

ORDER CODE

DWG NUMBER

48-Pin Plastic SSOP Type II

°C to +85°C

GTL2000 DL

SOT370–1

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