cbt3857 NXP Semiconductors, cbt3857 Datasheet - Page 2

• Manufacturer Part Number: cbt3857
• Description: 10-bit Bus Switch With 10 Kohm Pull-down Termination Resistors
• Manufacturer: NXP Semiconductors

Philips Semiconductors
FEATURES
QUICK REFERENCE DATA
ORDERING INFORMATION
PIN CONFIGURATION
24-Pin Plastic TSSOP Type I
1999 Sep 14
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 k pull-down resistors on B port
Internal 50 k 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
10-bit bus switch with 10 k pull-down
termination resistors
SYMBOL
C
I
t
t
C
PLH
PHL
CCZ
OUT
IN
PACKAGES
GND
V
Propagation delay
An to Yn
Input capacitance
Output capacitance
Total supply current
A10
REF
A1
A2
A3
A4
A5
A6
A7
A8
A9
10
12
11
2
3
4
5
6
7
8
9
1
PARAMETER
23
19
18
16
13
24
22
20
17
15
14
21
Î Î
SA00516
B10
Vcc
B1
B2
B3
B4
B5
B6
B7
B8
B9
OE
TEMPERATURE RANGE
0 C to +85 C
C
V
Outputs disabled; V
V
I
CC
L
= 0 V or V
= 30 pF; V
= 3.6 V
2
CC
T
CC
amb
DESCRIPTION
This 10-bit bus switch is designed for 3 V to 3.6 V V
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.
PIN DESCRIPTION
FUNCTION TABLE
H = High voltage level
L = Low voltage level
= 3.3 V
22, 21, 20, 19, 18,
17, 16, 15, 14, 13
CONDITIONS
= 25 C; GND = 0 V
PIN NUMBER
7, 8, 9, 10, 11
O
2, 3, 4, 5, 6,
= 0 V or V
12
23
24
1
INPUT
OE
CC
H
L
ORDER CODE
CBT3857 PW
SYMBOL
A1–A10
B1–B10
V
GND
V
OE
REF
CC
Reference output voltage
Inputs
Ground (V)
Outputs
Output enable
Positive supply voltage
TYPICAL
NAME AND FUNCTION
A port = B port
720
2.8
6.4
FUNCTION
1
Product specification
Disconnect
DWG NUMBER
CBT3857
853–2168 22329
SOT355–1
CC
operation
UNIT
mA
pF
pF
ps