Data sheet acquired from Cypress Semiconductor Corporation.
Data sheet modified to remove devices not offered.
CYBUS3384
1CYBUS3L384SCDS
SCDS103 - May 1994 - Revised February 2000
Dual 5-Bit Bus Switch
Functional Description
Features
• Zero propagation delay
The CYBUS3384 is a ten-bit, two-port bidirectional bus switch
that allows one bus to be connected directly to, or isolated
from, another without introducing additional propagation delay
or ground noise. The input and output voltage levels allow di-
rect interface with TTL and CMOS devices. Two bus enable
signals, BE1 and BE2, turn on the upper and lower five bits,
respectively.
• 2Ω switches connect inputs to outputs
• Direct bus connection when switches are ON
• High (>500 Meg Ω) resistance when switch is OFF
• Performs bidirectional translator function between
3.3V and 5.0V power supplies
• CMOS for low power dissipation
• Edge-rate control circuitry for significantly improved
noise characteristics
Designed with a low resistance of 2Ω, the CYBUS3384 is ideal
for use in VME or other high DC drive applications.
The power-off disable feature enables modules and cards to
be either inserted or withdrawn from operating equipment
without shutting down power. Additionally, the CYBUS3384 fa-
cilitates bidirectional interfacing between 3.3V and 5V systems
by placing a single diode in series with the 5V VCC line and a
resistor from pin 24 to ground.
• Inputs and outputs interface with 5.0V CMOS, TTL, or
3.3V CMOS
• ESD > 2000V
• Power-off disable
The CYBUS3384 is also suitable for small signal analog appli-
cations where crosstalk and off isolation performance of –66
dB at 50 MHz are required.
Logic Block Diagram
Pin Configurations
BE
1
SOIC/QSOP
Top View
BE
2
1
BE
1
24
V
CC
A
B
0
0
2
3
4
5
6
B
A
B
9
23
22
21
0
A
9
0
A
1
B
1
A
8
A
1
B
B
1
20
19
18
17
16
A
2
8
B
2
B
A
B
2
7
A
3
A
7
B
B
2
7
3
4
A
3
A
6
8
A
4
B
3
4
9
B
6
B
10
11
12
B
A
5
15
14
A
5
B
B
B
5
6
7
A
4
5
GND
BE
2
13
A
6
BUS3384-2
A
7
A
8
B
B
8
9
BUS3384-1
A
9
Function Table[1]
Pin Description
Inputs
Name
Description
BE1
H
BE2
H
B0–4
B5–9
High-Z
High-Z
A5–9
Function
Non-connect
Connect
A
B
Bus A, Inputs or Outputs
Bus B, Inputs or Outputs
Bus Switch Enable
High-Z
A0–4
L
H
BE1, BE2
H
L
High-Z
A0–4
Connect
L
L
A5–9
Connect
Note:
1. H = HIGH Voltage Level. L = LOW Voltage Level. X = Don’t Care.
Copyright © 2000, Texas Instruments Incorporated