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SCDS140 − OCTOBER 2003
D
D
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)
B-Port Outputs Are Precharged by Bias
Voltage (BIASV) to Minimize Signal
Distortion During Live Insertion and
Hot-Plugging
Control Inputs Can be Driven by TTL or
5-V/3.3-V CMOS Outputs
I
Supports Partial-Power-Down Mode
off
D
D
D
D
Supports PCI Hot Plug
Operation
Bidirectional Data Flow, With Near-Zero
Propagation Delay
Latch-Up Performance Exceeds 100 mA Per
JESD 78, Class II
Low ON-State Resistance (r
)
on
ESD Performance Tested Per JESD 22
− 2000-V Human-Body Model
(A114-B, Class II)
Characteristics (r = 3 Ω Typical)
on
Low Input/Output Capacitance Minimizes
Loading and Signal Distortion
− 1000-V Charged-Device Model (C101)
(C
= 5.5 pF Typical)
io(OFF)
D
Supports Both Digital and Analog
Applications: PCI Interface, Memory
Interleaving, Bus Isolation, Low-Distortion
Signal Gating
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)
RGY PACKAGE
(TOP VIEW)
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
V
BIASV
A1
CC
OE
B1
B2
B3
B4
B5
B6
B7
B8
A2
A3
A4
A5
A6
A7
A8
GND
1
20
19
18
17
16
15
14
13
12
2
3
4
5
6
7
8
9
A1
A2
A3
A4
A5
A6
A7
A8
OE
B1
B2
B3
B4
B5
B6
B7
10
11
description/ordering information
The SN74CBT6845C 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
SN74CBT6845C 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.
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Copyright 2003, Texas Instruments Incorporated
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1
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