Philips CBT3257 Technical data

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INTEGRATED CIRCUITS

CBT3257

Quad 1-of-2 multiplexer/demultiplexer

Product data
Supersedes data of 27 Sep 2002

Philips
Semiconductors

2002 Dec 13

Philips Semiconductors Product data

CBT3257Quad 1-of-2 multiplexer/demultiplexer

2

2002 Dec 13

FEATURES

• 5 Ω switch connection between two ports

• TTL-compatible input levels

• Minimal propagation delay through the switch

• Latch-up protection exceeds 500 mA per JESD78

• ESD protection exceeds 2000 V HBM per JESD22-A114,

200 V MM per JESD22-A115 and 1000 V CDM per JESD22-C101

DESCRIPTION

The CBT3257 is a quad 1-of-2 high-speed TTL-compatible
multiplexer/demultiplexer. The low on resistance of the switch allows
inputs to be connected to outputs without adding propagation delay
or generating additional ground bounce noise.

Output Enable (OE

) and select-control (S) inputs select the

appropriate B1 and B2 outputs for the A-input data.
The CBT3257 is characterized for operation from -40 to +85 °C.

PIN CONFIGURATION

1
2
3
4
5
6
7
89

10

11

12

13

14

15

16

S
1B1
1B2

1A
2B1
2B2

2A

GND

V

CC

OE
4B1
4B2
4A
3B1
3B2
3A

SA00533

PIN DESCRIPTION

PIN NUMBER SYMBOL NAME AND FUNCTION

1 S Select-control input

2, 3,
5, 6,

10, 11,

13, 14

1B1, 1B2,

2B1, 2B2
3B1, 3B2
4B1, 4B2

B outputs

4, 7, 9, 12 1A, 2A, 3A, 4A A inputs

8 GND Ground (0 V)
15 OE Output enable
16 V

CC

Positive supply voltage

ORDERING INFORMATION

PACKAGES TEMPERATURE RANGE ORDER CODE TOPSIDE MARK DWG NUMBER

16-pin plastic SO -40 to 85 °C CBT3257D CBT3257D SOT109-1
16-pin plastic SSOP -40 to 85 °C CBT3257DB CT3257 SOT338-1
16-pin plastic SSOP (QSOP) -40 to 85 °C CBT3257DS CBT3257 SOT519-1
16-pin plastic TSSOP -40 to 85 °C CBT3257PW CBT3257 SOT403-1

Standard packing quantities and other packaging data is available at www.philipslogic.com/packaging.

Philips Semiconductors Product data

CBT3257Quad 1-of-2 multiplexer/demultiplexer

2002 Dec 13

3

LOGIC DIAGRAM (positive logic)

4

1A

2

1B1

3

1B2

7

2A

5

2B1

6

2B2

9

3A

11

3B1

10

3B2

12

4A

14

4B1

13

4B2

1

S

15

OE

SA00638

FUNCTION TABLE

INPUTS

OE S

FUNCTION

L L A port = B1 port
L H A port = B2 port

H X Disconnect

Philips Semiconductors Product data

CBT3257Quad 1-of-2 multiplexer/demultiplexer

2002 Dec 13

4

ABSOLUTE MAXIMUM RATINGS

1

SYMBOL

PARAMETER CONDITIONS RATING UNIT

V

CC

DC supply voltage -0.5 to +7.0 V

V

I

DC input voltage

2

-0.5 to +7.0 V

Continuous channel current 128 mA

I

K

Input clamp current V

I/O

< 0 -50 mA

T

stg

Storage temperature range -65 to +150 °C

NOTES:

1. Stresses beyond those listed may cause permanent damage to the device. These are stress ratings only and functional operation of the
device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to
absolute-maximum-rated conditions for extended periods may affect device reliability.

2. The input and output negative-voltage ratings may be exceeded if the input and output clamp-current ratings are observed.

RECOMMENDED OPERATING CONDITIONS

LIMITS

SYMBOL PARAMETER

MIN MAX

UNIT

V

CC

DC supply voltage 4.5 5.5 V

V

IH

High-level input voltage 2.0 — V

V

IL

Low-level Input voltage — 0.8 V

T

amb

Operating free-air temperature range -40 +85 °C

NOTE:

1. All unused control inputs of the device must be held at V

CC

or GND to ensure proper device operation.

DC ELECTRICAL CHARACTERISTICS

LIMITS

SYMBOL PARAMETER TEST CONDITIONS T

amb

= -40 to +85 °C UNIT

MIN TYP

1

MAX

V

IK

Input clamp voltage VCC = 4.5 V; II = -18 mA — — -1.2 V

V

P

Pass voltage VI = VCC = 5.0 V; I/O = -100 mA 3.4 3.6 3.9 V

I

I

Input leakage current VCC = 5.5 V; VI = GND or 5.5 V — — ±1 µA

I

CC

Quiescent supply current VCC = 5.5 V; IO = 0, VI = VCC or GND — — 3 µA

∆I

CC

Additional supply current per input pin

2

VCC = 5.5 V, one input at 3.4 V,
other inputs at V

CC

or GND

— — 2.5 mA

C

I

Control pins VI= 3 V or 0 — 3.3 — pF

A port VO = 3 V or 0; OE = V

CC

— 9.9 — pF

C

IO(OFF)

Power-off leakage current

B port VO = 3 V or 0; OE = V

CC

— 6.4 — pF

VCC = 4.5 V; VI = 0V; II = 64 mA — 5 7 Ω

r

on

3

On-resistance

VCC = 4.5 V; VI = 0V; II = 30 mA — 5 7 Ω

on

VCC = 4.5 V; VI = 2.4 V; II = 15 mA — 10 15 Ω

NOTES:

1. All typical values are at VCC = 5 V, T

amb

= 25 °C.

2. This is the increase in supply current for each input that is at the specified TTL voltage level rather than VCC or GND

3. Measured by the voltage drop between the A and the B terminals at the indicated current through the switch.
On-state resistance is determined by the lowest voltage of the two (A or B) terminals.