CBT3857 データシートの表示（PDF） - Philips Electronics

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CBT3857

10-bit bus switch with 10 kohm pull-down termination resistors

Philips Electronics 

Philips Semiconductors

10-bit bus switch with 10 kΩ pull-down

termination resistors

Product specification

CBT3857

FEATURES

• Enable signal is SSTL_2 compatible

• Optimized for use in Double Data Rate (DDR) SDRAM

applications

• Flow-through architecture optimizes PCB layout

• Designed to be used with 200 Mbps

• Switch on resistance is designed to eliminate the need for series

resistor to DDR SDRAM

• Internal 10 kΩ pull-down resistors on B port

• Internal 50 kΩ pull-up resistor on output enable input

• Full DDR solution provided when used with SSTL16857 and

PCK857

• 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

This 10-bit bus switch is designed for 3 V to 3.6 V VCC operation

and SSTL_2 output enable (OE) input levels.

When OE is LOW, the 10-bit bus switch is on and port A is

connected to port B. When OE is HIGH, the switch is open, and a

high-impedance state exists between the two ports.

The low on-state resistance of the switch allows connections to be

made with minimal propagation delay.

The CBT3857 is characterized for operation from 0°C to +85°C.

QUICK REFERENCE DATA

SYMBOL

PARAMETER

tPLH

tPHL

CIN

COUT

ICCZ

Propagation delay

An to Yn

Input capacitance

Output capacitance

Total supply current

CONDITIONS

Tamb = 25°C; GND = 0 V

CL = 30 pF; VCC = 3.3 V

VI = 0 V or VCC

Outputs disabled; VO = 0 V or VCC

VCC = 3.6 V

TYPICAL

720

2.8

6.4

1

UNIT

ps

pF

pF

mA

ORDERING INFORMATION

PACKAGES

24-Pin Plastic TSSOP Type I

PIN CONFIGURATION

VREF 1

A1 2

A2 3

A3 4

A4 5

A5 6

A6 7

A7 8

A8 9

A9 10

A10 11

GND 12

TEMPERATURE RANGE

0°C to +85°C

ORDER CODE

CBT3857 PW

ÎÎ 24 Vcc

23 OE

22 B1

21 B2

20 B3

19 B4

18 B5

17 B6

16 B7

15 B8

14 B9

13 B10

PIN DESCRIPTION

PIN NUMBER

SYMBOL

1

2, 3, 4, 5, 6,

7, 8, 9, 10, 11

VREF

A1–A10

12

GND

22, 21, 20, 19, 18,

17, 16, 15, 14, 13

B1–B10

23

OE

24

VCC

FUNCTION TABLE

INPUT

OE

L

H

H = High voltage level

L = Low voltage level

DWG NUMBER

SOT355–1

NAME AND FUNCTION

Reference output voltage

Inputs

Ground (V)

Outputs

Output enable

Positive supply voltage

FUNCTION

A port = B port

Disconnect

1999 Sep 14

SA00516

2

853–2168 22329

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