IDT74CBTLV3257PGG8 - Integrated Device Technology, Inc.

INDUSTRIAL TEMPERATURE RANGE

IDT74CBTLV3257

LOW-VOLTAGE QUAD 2:1 MUX/DEMUX BUS SWITCH

1MA7 2001INDUSTRIAL TEMPERATURE RANGE

The IDT logo is a registered trademark of Integrated Device Technology, Inc.

FUNCTIONAL BLOCK DIAGRAM

FEATURES:

• Functionally equivalent to QS3257

•5

ΩΩ

Ω switch connection between two ports

• Isolation under power-off conditions

• Over-voltage tolerant

• Latch-up performance exceeds 100mA

•V

CC = 2.3V - 3.6V, Normal Range

• ESD > 2000V per MIL-STD-883, Method 3015;

> 200V using machine model (C = 200pF, R = 0)

• Available in SSOP, QSOP, and TSSOP packages

IDT74CBTLV3257

LOW-VOLTAGE

QUAD 2:1MUX/DEMUX

BUS SWITCH

FROM ENABLE

CIRCUITRY

1B2

2B2

3B2

1B1

2B1

3B1

4B2

4B1

DESCRIPTION:

The CBTLV3257 is a quad 2:1 multiplexer/demultiplexer. The low on-

state resistance of the switch allows connections to be made with minimal

propagation delay.

The select (S) input controls the data flow. The multiplexers/demultiplexers

are enabled when the output-enable (OE) input is low.

To ensure the high-impedance state during power up or power down,

OE should be tied to VCC through a pullup resistor; the minimum value of

the resistor is determined by the current-sinking capability of the driver.

SIMPLIFIED SCHEMATIC, EACH

SWITCH

APPLICATIONS:

• 3.3V High Speed Bus Switching, Multiplexing, and Bus Isolation

INDUSTRIAL TEMPERATURE RANGE

IDT74CBTLV3257

LOW-VOLTAGE QUAD 2:1 MUX/DEMUX BUS SWITCH

PIN CONFIGURATION

QSOP / SSOP/ TSSOP

TOP VIEW

Symbol Parameter Test Conditions Min. Max. Unit

VCC Supply Voltage 2.3 3.6 V

VIH High-Level Control Input Voltage VCC = 2.3V to 2.7V 1. 7 — V

VCC = 2.7V to 3.6V 2 —

VIL Low-Level Control Input Voltage VCC = 2.3V to 2.7V — 0. 7 V

VCC = 2.7V to 3.6V — 0. 8

TAOperating Free-Air Temperature −40 85 °C

OPERATING CHARACTERISTICS, TA = 25°C(1)

NOTE:

1. All unused control inputs of the device must be held at VCC or GND to ensure proper device operation.

Symbol Description Max Unit

VCC SupplyVoltage Range –0.5 to +4.6 V

VIInput Voltage Range –0.5 to +4.6 V

Continuous Channel Current 1 28 mA

IIK Input Clamp Current, VI/O < 0 –5 0 mA

TSTG Storage Temperature –65 to +150 °C

ABSOLUTE MAXIMUM RATINGS(1)

NOTE:

1 . Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause

permanent damage to the device. This is a stress rating only and functional operation

of the device at these or any other conditions above those indicated in the operational

sections of this specification is not implied. Exposure to absolute maximum rating

conditions for extended periods may affect reliability.

VCC

4B1

1B2

4B2

2B1

3B1

2B2

3B2

1B1 OE

GND 3A

161

314

413

512

611

710

215

NOTE:

1 . H = HIGH Voltage Level

L = LOW Voltage Level

X = Don't Care

Inputs

OE S Function

L L A Port = B1 Port

L H A Port = B2 Port

H X Disconnect

FUNCTION TABLE(1)

INDUSTRIAL TEMPERATURE RANGE

IDT74CBTLV3257

LOW-VOLTAGE QUAD 2:1 MUX/DEMUX BUS SWITCH

Symbol Parameter Test Conditions Min. Typ.(1) Max. Unit

VIK Control Inputs, Data Inputs VCC = 3V, II = –18mA — — –1.2 V

IIControl Inputs VCC = 3.6V, VI = VCC or GND — — ±1µA

IOZ Data I/O VCC = 3.6V, VO = 0 or 3.6V, switch disabled — — 20 µA

IOFF VCC = 0, VI or VO = 0 to 3.6V — — 50 µA

ICC VCC = 3.6V, IO = 0, VI = VCC or GND — — 10 µA

∆ICC(2) Control Inputs VCC = 3.6V, one input at 3V, other inputs at VCC or GND — — 300 µA

CIControl Inputs VI = 3V or 0 — 4 — pF

CIO(OFF) A Port VO = 3V or 0, OE = VCC = 3.3V — 13 — pF

B Port —6—

VCC = 2.3V VI = 0 IO = 64mA — 5 8

Typ. at VCC = 2.5V IO = 24mA — 5 8

RON(3) VI = 1.7V IO = 15mA — 27 40 Ω

VI = 0 IO = 64mA — 5 7

VCC = 3V IO = 24mA — 5 7

VI = 2.4V IO = 15mA — 10 15

DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE

Following Conditions Apply Unless Otherwise Specified:

Operating Conditions: TA = –40°C to +85°C

VCC = 2.5V ± 0.2V VCC = 3.3V ± 0.3V

Symbol Parameter Min. Max. Min. Max. Unit

tPD(1) Propagation Delay −0.15 −0.25 ns

A to B or B to A

tSEL Select Time 1 6.1 1 5.3 ns

S to A or B

tEN Enable Time 1 6.1 1 5.3 ns

S to B

tDIS Disable Time 1 4.8 1 4.5 ns

S to B

tEN Output Enable Time 1 5.6 1 5 ns

OE to A or B

tDIS Output Disable Time 1 5.5 1 5.5 ns

OE to A or B

NOTE:

1. The propagation delay is the calculated RC time constant of the typical on-state resistance of the switch and the specified load capacitance driven by an ideal voltage source

(zero output impedance).

SWITCHING CHARACTERISTICS

NOTES:

1. Typical values are at VCC = 3.3V, +25°C ambient.

2. The increase in supply current is attributable to each current that is at the specified voltage level rather than VCC or GND.

3. This is measured by the voltage drop between the A and B terminals at the indicated current through the switch. On-state resistance is determined by the lower of the voltages

of the two (A or B ) terminals.

INDUSTRIAL TEMPERATURE RANGE

IDT74CBTLV3257

LOW-VOLTAGE QUAD 2:1 MUX/DEMUX BUS SWITCH

Open

VLOAD

GND

VCC

Pulse

Generator D.U.T.

500Ω

VIN VOUT

(1, 2)

SAME PHASE

INPU T T RANSI TIO N

OPPOSITE PHASE

INPU T TR AN SIT ION

VOH

VOL

tPLH tPHL

tPHL

tPLH

OUTPUT

VIH

CONTROL

INPUT tPLZ 0V

OUTPUT

NORMALLY

LOW tPZH

SWITCH

CLOSED

OUTPUT

NORMALLY

HIGH

ENABLE DISABLE

SWITCH

OPEN

tPHZ

VOL + VLZ

VOH

tPZL

VLOAD/2 VLOAD/2

VIH

VOL

VOH -VHZ

TEST CIRCUITS AND WAVEFORMS

Test Circuits for All Outputs Enable and Disable Times

Propagation Delay

NOTES:

1. Pulse Generator for All Pulses: Rate ≤ 10MHz; tF ≤ 2.5ns; tR ≤ 2.5ns.

2. Pulse Generator for All Pulses: Rate ≤ 10MHz; tF ≤ 2ns; tR ≤ 2.5ns.

DEFINITIONS:

CL = Load capacitance: includes jig and probe capacitance.

RT = Termination resistance: should be equal to ZOUT of the Pulse Generator.

Symbol VCC(1)= 3.3V±0.3V VCC(2)= 2.5V±0.2V Unit

VLOAD 6 2 x Vcc V

VIH 3 Vcc V

VT1.5 Vcc / 2 V

VLZ 300 150 mV

VHZ 300 150 mV

CL50 30 pF

TEST CONDITIONS

Test Switch

tPLZ/tPZL VLOAD

tPHZ/tPZH GND

tSEL Open

tPD Open

SWITCH POSITION

INDUSTRIAL TEMPERATURE RANGE

IDT74CBTLV3257

LOW-VOLTAGE QUAD 2:1 MUX/DEMUX BUS SWITCH

IDT XX CBTLV XXX XX

PackageDevice Type

Temp. Range

PGG

Quarter-Size Small Outline Package

Shrink Small Outline Package

Thi n Shrink Sm al l Out li n e Pac kage

TSSOP - Green

Low-Voltage Quad 2:1 Mux/Demux Bus Switch

–40°C to +85°C

3257

ORDERING INFORMATION

CORPORATE HEADQUARTERS for SALES: for Tech Support:

2975 Stender Way 800-345-7015 or 408-727-6116 logichelp@idt.com

Santa Clara, CA 95054 fax: 408-492-8674 (408) 654-6459