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Texas Instruments (TI) Electronic Components Datasheet

SN74CBT16800 Datasheet

20-Bit FET Bus Switch

No Preview Available !

D 5-Switch Connection Between Two Ports
D TTL-Compatible Input Levels
D B-Port Outputs Are Precharged by Bias
Voltage to Minimize Signal Distortion
During Live Insertion
D Package Options Include Plastic Thin
Shrink Small-Outline (DGG) and Thin Very
Small-Outline (DGV) Packages
description
The SN74CBT16800 provides 20 bits of
high-speed TTL-compatible bus switching. The
low on-state resistance of the switch allows
connections to be made with minimal propagation
delay. The device also precharges the B port to a
user-selectable bias voltage (BIASV) to minimize
live-insertion noise.
The device is organized as dual 10-bit bus
switches with separate output-enable (OE)
inputs. It can be used as two 10-bit bus switches
or one 20-bit bus switch. When OE is low, the
associated 10-bit bus switch is on and port A is
connected to port B. When OE is high, the switch
is open, the high-impedance state exists between
the two ports, and port B is precharged to BIASV
through the equivalent of a 10-kresistor.
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.
The SN74CBT16800 is characterized for
operation from –40°C to 85°C.
FUNCTION TABLE
(each 10-bit bus switch)
INPUT
OE
FUNCTION
L A port = B port
A port = Z
H B port = BIASV
SN74CBT16800
20-BIT FET BUS SWITCH
WITH PRECHARGED OUTPUTS
SCDS090 – MAY 1999
DGG OR DGV PACKAGE
(TOP VIEW)
BIASV
1A1
1A2
1A3
1A4
1A5
1A6
GND
1A7
1A8
1A9
1A10
2A1
2A2
VCC
2A3
GND
2A4
2A5
2A6
2A7
2A8
2A9
2A10
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
48 1OE
47 2OE
46 1B1
45 1B2
44 1B3
43 1B4
42 1B5
41 GND
40 1B6
39 1B7
38 1B8
37 1B9
36 1B10
35 2B1
34 2B2
33 2B3
32 GND
31 2B4
30 2B5
29 2B6
28 2B7
27 2B8
26 2B9
25 2B10
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCT PREVIEW information concerns products in the formative or
design phase of development. Characteristic data and other
specifications are design goals. Texas Instruments reserves the right to
change or discontinue these products without notice.
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
Copyright © 1999, Texas Instruments Incorporated
1


Texas Instruments (TI) Electronic Components Datasheet

SN74CBT16800 Datasheet

20-Bit FET Bus Switch

No Preview Available !

SN74CBT16800
20-BIT FET BUS SWITCH
WITH PRECHARGED OUTPUTS
SCDS090 – MAY 1999
logic diagram (positive logic)
2
1A1
1
BIASV
46
1B1
12
1A10
48
1OE
13
2A1
36
1B10
35
2B1
24
2A10
25
2B10
47
2OE
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 7 V
Bias voltage range, BIASV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 7 V
Input voltage range, VI (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 7 V
Continuous channel current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128 mA
Input clamp current, IIK (VI < 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –50 mA
Package thermal impedance, θJA (see Note 2): DGG package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89°C/W
DGV package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93°C/W
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to 150°C
Stresses beyond those listed under “absolute maximum ratings” 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.
NOTES: 1. The input and output negative-voltage ratings may be exceeded if the input and output clamp-current ratings are observed.
2. The package thermal impedance is calculated in accordance with JESD 51.
2 POST OFFICE BOX 655303 DALLAS, TEXAS 75265


Part Number SN74CBT16800
Description 20-Bit FET Bus Switch
Maker Texas
Total Page 5 Pages
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