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IDT74CBTLV3244 LOW-VOLTAGE OCTAL BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
LOW-VOLTAGE OCTAL BUS SWITCH
IDT74CBTLV3244
FEATURES:
- - - - - - - - Pin-out compatible with standard '244 logic 5 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
DESCRIPTION:
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
FUNCTIONAL BLOCK DIAGRAM
2 1A1 SW 18 1B1
SIMPLIFIED SCHEMATIC, EACH SWITCH
8 1A4
SW
12 1B4 A B
1 1OE
OE
11 2A1 SW
9 2B1
17 2A4
SW
3 2B4
19 2OE
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
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c 2001 Integrated Device Technology, Inc.
SEPTEMBER 2001
DSC-5393/2
IDT74CBTLV3244 LOW-VOLTAGE OCTAL BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS
Symbol VCC VI Description Supply Voltage Range Input Voltage Range Continuous Channel Current IIK Input Clamp Current, , VI/O < 0 Storage Temperature TSTG Max. -0.5 to 4.6 -0.5 to 4.6 128 -50
(1)
Unit V V mA mA C
1OE
1A1 2B4 1A2 2B3 1A3 2B2 1A4 2B1
1 2 3 4 5 6 7 8 9 10
20 19 18 17 SO20-7 SO20-8 16 SO20-9 15 14 13 12 11
VCC 2OE
1B1 2A4 1B2 2A3 1B3 2A2 1B4 2A1
-65 to +150
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.
PIN DESCRIPTION
Pin Names xOE Ax Bx Description Output Enable (Active LOW) Port A Inputs or Outputs Port B Inputs or Outputs
GND
SSOP/ TSSOP/ QSOP TOP VIEW
FUNCTION TABLE
Input 1OE H L H L 2OE H H L L
(1)
2A, 2B I/Os Disconnect Disconnect 2A Port = 2B Port 2A Port = 2B Port
1A, 1B I/Os Disconnect 1A Port = 1B Port Disconnect 1A Port = 1B Port
NOTE: 1. H = HIGH Voltage Level L = LOW Voltage Level
OPERATING CHARACTERISTICS, TA = 25C
Symbol VCC VIH VIL TA Parameter Supply Voltage High-Level Control Input Voltage Low-Level Control Input Voltage Operating Free-Air Temperature VCC = 2.3V to 2.7V VCC = 2.7V to 3.6V VCC = 2.3V to 2.7V VCC = 2.7V to 3.6V Test Conditions Min. 2.3 1.7 2 -- -- -40 Max. 3.6 -- -- 0.7 0.8 85 C V Unit V V
NOTE: 1. All unused control inputs must be held at VCC or GND to ensure proper device operation.
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IDT74CBTLV3244 LOW-VOLTAGE OCTAL BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified: Operating Condition: TA = - 40C to +85C
Symbol VIK II IOZ IOFF ICC ICC (1) CI CIO(OFF) Max at VCC = 2.3V Typ at VCC = 2.5V
RON (2)
Parameter Control Inputs, Data I/O Control Inputs, Data I/O Data I/O
Test Conditions VCC = 3V, II = -18mA VCC = 3.6V, VI = VCC or GND VCC = 3.6V, VO = 0 or 3.6V, switch disabled VCC = 0, VI or VO = 0 to 3.6V VCC = 3.6V, IO = 0, VI = VCC or GND
Min. -- -- -- -- -- -- -- --
Typ. -- -- -- -- -- -- 4 6 5 5 27 5 5 10
Max. - 1.2 1 5 50 10 300 -- -- 8 8 40 7 7 15
Unit V A A A A A pF pF
Control Inputs Control Inputs
VCC = 3.6V, One input at 3V, Other inputs at VCC or GND VI = 3V or 0 VO = 3V or 0, OE = VCC VI = 0 VI = 1.7V VI = 0 IO = 64mA IO = 24mA IO = 15mA IO = 64mA IO = 24mA VI = 2.4V IO = 15mA
-- -- -- -- -- --
VCC = 3V
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 Min. Max. 0.15 4.5 4.5 VCC = 3.3V 0.3V Min. Max. 0.25 4 5 Unit ns ns ns
1 1
1 1
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).
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IDT74CBTLV3244 LOW-VOLTAGE OCTAL BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
TEST CIRCUITS AND WAVEFORMS
TEST CONDITIONS
Symbol VLOAD VIH VT VLZ VHZ CL VCC(1)= 3.3V 0.3V 6 3 1.5 300 300 50 VCC(2)= 2.5V 0.2V 2 x Vcc Vcc VCC/2 150 150 30 Unit V V V mV mV pF
OPPOSITE PHASE INPUT TRANSITION OUTPUT tPLH tPHL
PROPAGATION DELAY
SAME PHASE INPUT TRANSITION tPLH tPHL VIH VT 0V VOH VT VOL VIH VT 0V
TEST CIRCUITS FOR ALL OUTPUTS
VCC 500 Pulse Generator
(1, 2)
ENABLE AND DISABLE TIMES
ENABLE DISABLE CONTROL INPUT tPZL OUTPUT SW ITCH NORMALLY CLO SED LOW tPZH OUTPUT SW ITCH NORMALLY OPE N HIGH VLOAD/2 VT tPHZ VT 0V tPLZ VIH VT 0V VLOAD/2 VOL + VLZ VOL VOH VOH -V HZ 0V
VLOAD Open GND
VIN D.U.T.
VOUT
RT
500 CL
DEFINITIONS: 1. CL = Load capacitance: includes jig and probe capacitance. 2. RT = Termination resistance: should be equal to ZOUT of the Pulse Generator. 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.
NOTE: 1. Diagram shown for input control Enable-LOW and input Control Disable-HIGH.
SWITCH POSITION
Test tPLZ/tPZL tPHZ/tPZH
tPD
Switch VLOAD GND Open
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IDT74CBTLV3244 LOW-VOLTAGE OCTAL BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
ORDERING INFORMATION
IDT XX CBTLV XXX Device Type XX Package Tem p. Range
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
-40C to +85C
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