SN74CBT3384
10-BIT CROSSBAR SWITCH
SCDS004B – NOVEMBER 1992 – REVISED JUNE 1994
Copyright 1994, Texas Instruments Incorporated
11–1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
•Functionally Equivalent to QS3384 and
QS3L384
•5-Ω Switch Connection Between Two Ports
•TTL-Compatible Input and Output Levels
•Package Options Include Plastic
Small-Outline (DW), Shrink Small-Outline
(DB), and Thin Shrink Small-Outline (PW)
Packages
description
The SN74CBT3384 provides ten bits of
high-speed TTL-compatible bus switching. The
low on resistance of the switch allows connections
to be made without adding propagation delay.
The device is organized as two 5-bit switches with separate output-enable (OE) inputs. When OE is low, the
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 SN74CBT3384 is characterized for operation from 0°C to 70°C.
FUNCTION TABLE
OE1 OE2 B1– B5 B6–B10
L L A1 –A5 A6–A10
L H A1 –A5 Z
H L Z A6–A10
H H Z Z
DB, DW, OR PW PACKAGE
(TOP VIEW)
OE1
B1
A1
A2
B2
B3
A3
A4
B4
B5
A5
GND
VCC
B10
A10
A9
B9
B8
A8
A7
B7
B6
A6
OE2
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
SN74CBT3384
10-BIT CROSSBAR SWITCH
SCDS004B – NOVEMBER 1992 – REVISED JUNE 1994
11–2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
logic diagram
A1
A5
OE1
B1
B5
A6
A10
OE2
B6
B10
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)†
Supply voltage range, VCC –0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage range, VI (see Note 1) –0.5 V to 6 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous channel current 128 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input clamp current, IIK (VI/O < 0) –50 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maximum power dissipation at TA = 55°C (in still air) (see Note 2): DB package 0.6 W. . . . . . . . . . . . . . . . . .
DW package 1.6 W. . . . . . . . . . . . . . . . .
PW package 0.7 W. . . . . . . . . . . . . . . . . .
Storage temperature range –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 af fect 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 maximum package power dissipation is calculated using a junction temperature of 150°C and a board trace length of 750 mils.
For more information, refer to the
Package Thermal Considerations
application note.
recommended operating conditions
MIN MAX UNIT
VCC Supply voltage 4.75 5.25 V
VIH High-level control input voltage 2 V
VIL Low-level control input voltage 0.8 V
TAOperating free-air temperature 0 70 °C
SN74CBT3384
10-BIT CROSSBAR SWITCH
SCDS004B – NOVEMBER 1992 – REVISED JUNE 1994
11–3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP†MAX UNIT
VIK VCC = 4.5 V, II = –18 mA –1.2 V
IIVCC = 5.25 V, VI = 5.25 V or GND ±5µA
IOS VCC = 4.75 V, VI(A) = 0, VI(B) = 4.75 V 250 mA
ICC VCC = 5.5 V, IO = 0, VI = VCC or GND 50 µA
∆ICC‡Control pins VCC = 5.25 V, One input at 3.4 V, Other inputs at VCC or GND 2.5 mA
CiControl pins VI = 3 V or 0 3 pF
Cio(OFF) VO = 3 V or 0, OE = VCC 6pF
§
VI = 0, II = 64 mA 5 7
ron
§
VCC = 4.75 V VI = 0, II = 30 mA 5 7 Ω
VI = 2.4 V, II = 15 mA 10 15
†All typical values are at VCC = 5 V, TA = 25°C.
‡This is the increase in supply current for each input that is at the specified TTL voltage level rather than VCC or GND.
§Measured by the voltage drop between the A and B pin at the indicated current through the switch. On resistance is determined b y the lower of
the voltages of the two (A or B) pins.
switching characteristics over recommended operating free-air temperature range, CL = 50 pF
(unless otherwise noted) (see Note 3)
PARAMETER FROM
(INPUT) TO
(OUTPUT) MIN MAX UNIT
tpd¶A or B B or A 0.25 ns
ten OE A or B 1 8.5 ns
tdis OE A or B 1 8.5 ns
¶This parameter is characterized but not tested. This propagation delay is based on the RC time constant of the typical on resistance of the switch
and a load capacitance of 50 pF.
NOTE 3: Load circuit and voltage waveforms are shown in Section 1.
SN74CBT3384
10-BIT CROSSBAR SWITCH
SCDS004B – NOVEMBER 1992 – REVISED JUNE 1994
11–4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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