IDT IDT74CBTLV3244Q Low-voltage octal bus switch Datasheet

IDT74CBTLV3244
LOW-VOLTAGE OCTAL BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
LOW-VOLTAGE OCTAL
BUS SWITCH
DESCRIPTION:
FEATURES:
–
–
–
–
–
–
–
–
IDT74CBTLV3244
Pin-out compatible with standard '244 logic
5Ω A/B bidirectional switch
Isolation Under Power-Off Conditions
Over-voltage tolerant
Latch-up performance exceeds 100mA
VCC = 2.3V - 3.6V, Normal Range
ESD > 2000V per MIL-STD-883, Method 3015;
> 200V using machine model (C = 200pF, R = 0)
Available in SSOP, QSOP, and TSSOP packages
The octal bus switch has standard 244 pinouts. The CBTLV3244 is
designed for asynchronous communication between data buses. Sets of
four switches are controlled by one output Enable (OE). When OE is low,
the set of four bus switches is on and port A is connected to port B. When
OE is high, the set of four bus switches is off and a high impedance exists
between port A and port B.
To ensure the high-impedance state during power up or power down,
both OEs should be tied to VCC through a pullup resistor.
APPLICATIONS:
– 3.3V High Speed Bus Switching and Bus Isolation
SIMPLIFIED SCHEMATIC, EACH
SWITCH
FUNCTIONAL BLOCK DIAGRAM
18
2
SW
1A1
8
1A4
SW
1B1
12
1B4
B
A
1
1OE
OE
9
11
SW
2A1
17
2A4
SW
2B1
3
2B4
19
2OE
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
SEPTEMBER 2001
1
c
2001
Integrated Device Technology, Inc.
DSC-5393/2
IDT74CBTLV3244
LOW-VOLTAGE OCTAL BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
ABSOLUTE MAXIMUM RATINGS
PIN CONFIGURATION
1OE
1
20
V CC
1A 1
2
19
2OE
2B 4
3
18
1B 1
1A 2
4
2A 4
2B 3
5
1B 2
1A 3
6
17
SO20-7
SO20-8 16
SO20-9
15
2B 2
7
14
1B 3
1A 4
8
13
2A 2
2B 1
9
12
1B 4
10
11
2A 1
GND
(1)
Symbol
VCC
Description
Supply Voltage Range
Max.
–0.5 to 4.6
VI
Input Voltage Range
–0.5 to 4.6
V
128
mA
–50
mA
–65 to +150
°C
Continuous Channel Current
IIK
Input Clamp Current, , VI/O < 0
TSTG
Storage Temperature
Unit
V
NOTE:
1. Stresses greater than those listed under ABSOLUTE MAXIMUM
RATINGS may cause permanent damage to the device. This is a
stress rating only and functional operation of the device at these or
any other conditions above those indicated in the operational sections
of this specification is not implied. Exposure to absolute maximum
rating conditions for extended periods may affect reliability.
2A 3
PIN DESCRIPTION
Pin Names
xOE
Description
Output Enable (Active LOW)
Ax
Port A Inputs or Outputs
Bx
Port B Inputs or Outputs
SSOP/ TSSOP/ QSOP
TOP VIEW
FUNCTION TABLE
(1)
Input
1OE
H
2OE
H
1A, 1B I/Os
Disconnect
2A, 2B I/Os
Disconnect
L
H
1A Port = 1B Port
Disconnect
H
L
Disconnect
2A Port = 2B Port
L
L
1A Port = 1B Port
2A Port = 2B Port
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
OPERATING CHARACTERISTICS, TA = 25ºC
Symbol
VCC
Supply Voltage
VIH
High-Level Control Input Voltage
VIL
TA
Parameter
Low-Level Control Input Voltage
Min.
2.3
Max.
3.6
Unit
VCC = 2.3V to 2.7V
1.7
—
V
VCC = 2.7V to 3.6V
2
—
VCC = 2.3V to 2.7V
—
0.7
VCC = 2.7V to 3.6V
—
0.8
−40
85
Test Conditions
Operating Free-Air Temperature
NOTE:
1. All unused control inputs must be held at VCC or GND to ensure proper device operation.
2
V
V
°C
IDT74CBTLV3244
LOW-VOLTAGE OCTAL BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Operating Condition: TA = – 40°C to +85°C
Symbol
VIK
Parameter
Control Inputs, Data I/O
Test Conditions
VCC = 3V, II = −18mA
Min.
—
Typ.
—
Max.
– 1.2
Unit
V
II
Control Inputs, Data I/O
IOZ
Data I/O
VCC = 3.6V, VI = VCC or GND
—
—
±1
µA
VCC = 3.6V, VO = 0 or 3.6V, switch disabled
—
—
5
µA
IOFF
VCC = 0, VI or VO = 0 to 3.6V
—
—
50
µA
ICC
VCC = 3.6V, IO = 0, VI = VCC or GND
—
—
10
µA
∆ICC (1)
Control Inputs
VCC = 3.6V, One input at 3V, Other inputs at VCC or GND
—
—
300
µA
CI
Control Inputs
VI = 3V or 0
—
4
—
pF
VO = 3V or 0, OE = VCC
—
6
—
pF
IO = 64mA
—
5
8
IO = 24mA
—
5
8
VI = 1.7V
IO = 15mA
—
27
40
VI = 0
IO = 64mA
—
5
7
IO = 24mA
—
5
7
IO = 15mA
—
10
15
CIO(OFF)
Max at VCC = 2.3V
VI = 0
Typ at VCC = 2.5V
RON (2)
VCC = 3V
VI = 2.4V
Ω
NOTES:
1. The increase in supply current is attributable to each input that is at the specified voltage level rather than VCC or GND.
2. This is measured by the voltage drop between the A and B terminals at the indicated current through the switch.
SWITCHING CHARACTERISTICS
VCC = 2.5V ± 0.2V
Symbol
tPD(1)
tEN
tDIS
Parameter
Propagation Delay
A to B or B to A
Output Enable Time
OE to A or B
Output Disable Time
OE to A or B
VCC = 3.3V ± 0.3V
Min.
Max.
0.15
Min.
Max.
0.25
Unit
ns
1
4.5
1
4
ns
1
4.5
1
5
ns
NOTE:
1. The propagation delay is the calculated RC time constant of the typical on-state resistance of the switch and the specified load capacitance when
driven by an ideal voltage source (zero output impedance).
3
IDT74CBTLV3244
LOW-VOLTAGE OCTAL BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
TEST CIRCUITS AND WAVEFORMS
TEST CONDITIONS
PROPAGATION DELAY
Symbol
VLOAD
VCC(1)= 3.3V ± 0.3V
6
VCC(2)= 2.5V ± 0.2V
2 x Vcc
Unit
V
VIH
3
Vcc
V
VT
1.5
VCC/2
V
VLZ
300
150
mV
VHZ
300
150
mV
CL
50
30
pF
SAME PHASE
INPUT TRANSITION
V IH
VT
0V
DISABLE
ENABLE
500 Ω
CONTROL
INPUT
GND
t PZL
V OUT
D.U.T.
RT
t PHL
OUTPUT
SW ITCH
NORMALLY
CLO SED
LOW
t PZH
OUTPUT SW ITCH
NORMALLY
OPE N
HIGH
500 Ω
CL
DEFINITIONS:
1. CL = Load capacitance: includes jig and probe capacitance.
2. RT = Termination resistance: should be equal to ZOUT of the Pulse
Generator.
SWITCH POSITION
Switch
VLOAD
tPHZ/tPZH
GND
tPD
Open
t PLZ
V IH
VT
0V
V LO AD/2
V LO AD/2
VT
V OL + V LZ
V OL
tPHZ
VT
V OH
V OH - V HZ
0V
0V
NOTE:
1. Diagram shown for input control Enable-LOW and input Control
Disable-HIGH.
NOTES:
1. Pulse Generator for all pulses: Rate ≤ 10MHz; tF ≤ 2.5ns; tR ≤ 2.5ns.
2. Pulse Generator for all pulses: Rate ≤ 10MHz; tF ≤ 2ns; tR ≤ 2ns.
Test
tPLZ/tPZL
VOH
VT
V OL
ENABLE AND DISABLE TIMES
Open
Pulse
Generator
t PLH
V LO AD
V CC
V IN
t PHL
OPPOSITE PHASE
INPUT TRANSITION
TEST CIRCUITS FOR ALL OUTPUTS
(1, 2)
tPLH
OUTPUT
V IH
VT
0V
4
IDT74CBTLV3244
LOW-VOLTAGE OCTAL BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
ORDERING INFORMATION
IDT
XX
Tem p. Range
CBTLV
XXX
XX
Device Type
Package
CORPORATE HEADQUARTERS
2975 Stender Way
Santa Clara, CA 95054
PY
Q
PG
Shrink Small Outline Package (SO20-7)
Quarter-size Sm all Outline Package (SO20-8)
Thin Shrink Sm all Outline Package (SO20-9)
3244
Low-Voltage Octal Bus Switch
74
–40°C to +85°C
for SALES:
800-345-7015 or 408-727-6116
fax: 408-492-8674
www.idt.com
5
for Tech Support:
[email protected]
(408) 654-6459
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