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SCDS138 − OCTOBER 2003
D
D
D
Member of the Texas Instruments
Widebus Family
Undershoot Protection for Off-Isolation on
A and B Ports Up to −2 V
D
V
Operating Range From 4 V to 5.5 V
CC
D
D
D
D
D
Data I/Os Support 0 to 5-V Signaling Levels
(0.8-V, 1.2-V, 1.5-V, 1.8-V, 2.5-V, 3.3-V, 5-V)
Control Inputs Can be Driven by TTL or
5-V/3.3-V CMOS Outputs
B-Port Outputs Are Precharged by Bias
Voltage (BIASV) to Minimize Signal
Distortion During Live Insertion and
Hot-Plugging
I
Supports Partial-Power-Down Mode
off
Operation
Latch-Up Performance Exceeds 100 mA Per
JESD 78, Class II
D
D
D
D
Supports PCI Hot Plug
Bidirectional Data Flow, With Near-Zero
Propagation Delay
ESD Performance Tested Per JESD 22
− 2000-V Human-Body Model
(A114-B, Class II)
Low ON-State Resistance (r
)
on
Characteristics (r = 3 Ω Typical)
− 1000-V Charged-Device Model (C101)
on
Low Input/Output Capacitance Minimizes
Loading and Signal Distortion
D
Supports Both Digital and Analog
Applications: PCI Interface, Memory
Interleaving, Bus Isolation, Low-Distortion
Signal Gating
(C
= 5.5 pF Typical)
io(OFF)
D
D
Data and Control Inputs Provide
Undershoot Clamp Diodes
Low Power Consumption
(I
= 3 µA Max)
CC
DB, DBQ, DGV, DW, OR PW PACKAGE
(TOP VIEW)
1
24
23
22
21
20
19
18
17
16
15
14
13
ON
A1
A2
A3
A4
A5
A6
A7
A8
V
CC
B1
2
3
B2
B3
B4
B5
B6
B7
B8
B9
4
5
6
7
8
9
10
11
12
A9
A10
GND
B10
BIASV
description/ordering information
The SN74CBT6800C is a high-speed TTL-compatible FET bus switch with low ON-state resistance (r ),
on
allowing for minimal propagation delay. Active Undershoot-Protection Circuitry on the A and B ports of the
SN74CBT6800C provides protection for undershoot up to −2 V by sensing an undershoot event and ensuring
that the switch remains in the proper OFF state. The device also precharges the B port to a user-selectable bias
voltage (BIASV) to minimize live-insertion noise.
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.
Widebus is a trademark of Texas Instruments.
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Copyright 2003, Texas Instruments Incorporated
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1
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