IDT74CBTLV3245Q8 [IDT]
Bus Driver, CBTLV/3B Series, 1-Func, 8-Bit, True Output, CMOS, PDSO20, QSOP-20;
| 型号： | IDT74CBTLV3245Q8 |
| 厂家： | 
INTEGRATED DEVICE TECHNOLOGY |
| 描述： | Bus Driver, CBTLV/3B Series, 1-Func, 8-Bit, True Output, CMOS, PDSO20, QSOP-20 驱动 光电二极管 逻辑集成电路 |
| 文件： | 总5页 (文件大小：128K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LOW-VOLTAGE OCTAL
BUS SWITCH
IDT74CBTLV3245
DESCRIPTION:
FEATURES:
–
–
–
–
–
–
–
Pin-outcompatible withstandard'245logic
5ΩA/Bbidirectionalswitch
IsolationUnderPower-OffConditions
Over-voltage tolerant
Latch-upperformance 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 inSSOP, QSOP, andTSSOPpackages
The octal bus switch has standard 245 pinouts. The CBTLV3245 is
designedforasynchronous communicationbetweendata buses. When
OutputEnable(OE)islow,the8-bitbusswitchisonandportAisconnected
toPortB. WhenOE is high,the switchis offanda highimpedance exists
between Port A and Port B.
To ensure the high-impedance state during power up or power down,
OE should be tied to VCC through a pullup resistor.
–
APPLICATIONS:
– 3.3V High Speed Bus Switching and Bus Isolation
FUNCTIONALBLOCKDIAGRAM
2
18
SW
A1
B1
A
B
9
11
SW
A8
B8
19
OE
OE
TheIDTlogoisaregisteredtrademarkofIntegratedDeviceTechnology,Inc.
INDUSTRIAL TEMPERATURE RANGE
JANUARY 2001
1
c
2001 Integrated Device Technology, Inc.
DSC-5170/-
IDT74CBTLV3245
LOW-VOLTAGEOCTALBUSSWITCH
INDUSTRIALTEMPERATURERANGE
ABSOLUTE MAXIMUM RATINGS (1)
PINCONFIGURATION
Symbol
Description
Supply Voltage Range
Max.
Unit
VCC
–0.5 to 4.6
V
–0.5 to 4.6
128
V
VI
Input Voltage Range
Continuous Channel Current
Input Clamp Current, , VI/O < 0
Storage Temperature
mA
mA
°C
20
1
VCC
OE
B1
NC
IIK
–50
2
19
18
17
A1
TSTG
–65 to +150
3
NOTE:
A2
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.
B2
4
5
A3
A4
A5
SO20-7
SO20-8
SO20-9
B3
B4
B5
16
6
15
14
13
6
7
A
B6
A7
A8
8
PIN DESCRIPTION
Pin Names
12
11
9
B7
B8
Description
Output Enable (Active LOW)
GND
OE
10
Ax
Bx
Port A Inputs or Outputs
Port B Inputs or Outputs
SSOP/ TSSOP/ QSOP
TOP VIEW
FUNCTION TABLE (1)
Input
Operation
OE
L
A Port = B Port
Isolation
H
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
OPERATING CHARACTERISTICS, TA = 25ºC
Unit
V
Symbol
Parameter
Test Conditions
Min.
Max.
VCC
Supply Voltage
2.3
3.6
—
VIH
VIL
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
1.7
2
V
—
—
—
−40
0.7
0.8
+85
V
°C
TA
NOTE:
1. All unused control inputs must be held at VCC or GND to ensure proper device operation.
2
IDT74CBTLV3245
INDUSTRIALTEMPERATURERANGE
LOW-VOLTAGEOCTALBUSSWITCH
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Operating Condition: TA = – 40°C to +85°C
Symbol
Parameter
Test Conditions
VCC = 3V, II = −18mA
Min.
Typ. (1)
Max.
Unit
VIK
Control Inputs, Data Inputs
—
—
– 1.2
V
II
Control Inputs, Data I/O
Data I/O
VCC = 3.6V, VI = VCC or GND
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
4
±1
5
µA
µA
µA
µA
µA
pF
IOZ
IOFF
ICC
VCC = 3.6V, VO = 0 or 3.6V, switch disabled
VCC = 0, VI or VO = 0 to 3.6V
50
10
300
—
—
8
VCC = 3.6V, IO = 0, VI = VCC or GND
VCC = 3.6V, One input at 3V, Other inputs at VCC or GND
VI = 3V or 0
(2)
∆ICC
Control Inputs
Control Inputs
CI
CIO(OFF)
VO = 3V or 0, OE = VCC
6
pF
Max at VCC = 2.3V
Typ at VCC = 2.5V
VI = 0
IO = 64mA
IO = 24mA
IO = 15mA
IO = 64mA
IO = 24mA
IO = 15mA
5
5
8
(3)
VI = 1.7V
VI = 0
27
5
40
7
Ω
ON
R
VCC = 3V
5
7
VI = 2.4V
10
15
NOTES:
1. Typical values are at 3.3V, +25°C ambient.
2. The increase in supply current is attributable to each input that is at the specified voltage level rather than VCC or GND.
3. 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
VCC = 3.3V ± 0.3V
Symbol
Parameter
Min.
Max.
Min.
Max.
Unit
(1)
tPD
Propagation Delay
A to B or B to A
Output Enable Time
OE to A or B
0.15
4.5
5
0.25
4.2
5
ns
tEN
tDIS
1
1
1
1
ns
ns
Output Disable Time
OE to A or B
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
IDT74CBTLV3245
LOW-VOLTAGEOCTALBUSSWITCH
INDUSTRIALTEMPERATURERANGE
TESTCIRCUITSANDWAVEFORMS
TEST CONDITIONS
PROPAGATION DELAY
VIH
(1)
(2)
Symbol
VCC = 3.3V ± 0.3V
VCC = 2.5V ± 0.2V
Unit
SAME PHASE
INPUT TRANSITION
T
V
VLOAD
6
2 xVcc
V
0V
tPHL
tPLH
VIH
VT
3
Vcc
VCC/2
150
V
V
VOH
VT
VOL
OUTPUT
1.5
300
300
50
VLZ
VHZ
CL
mV
mV
pF
tPHL
tPLH
IH
V
150
OPPOSITE PHASE
INPUT TRANSITION
VT
0V
30
TEST CIRCUITS FOR ALL OUTPUTS ENABLE AND DISABLE TIMES
VLOAD
VCC
DISABLE
ENABLE
VIH
VT
Open
GND
CONTROL
INPUT
500Ω
500Ω
0V
tPZL
tPLZ
VIN
VOUT
Pulse(1, 2)
Generator
VLOAD/2
VT
D.U.T.
VLOAD/2
VOL + VLZ
VOL
OUTPUT
NORMALLY
LOW
SWITCH
CLOSED
tPHZ
RT
tPZH
CL
VOH
VOH -VHZ
OUTPUT
NORMALLY
HIGH
SWITCH
OPEN
VT
0V
0V
DEFINITIONS:
NOTE:
1. CL = Load capacitance: includes jig and probe capacitance.
1. Diagram shown for input control Enable-LOW and input Control
Disable-HIGH.
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.
SWITCH POSITION
Test
tPLZ tPZL
Switch
VLOAD
/
tPHZ/ PZH
GND
Open
t
PD
t
4
IDT74CBTLV3245
INDUSTRIALTEMPERATURERANGE
LOW-VOLTAGEOCTALBUSSWITCH
ORDERING INFORMATION
XXX
XX
CBTLV
IDT
XX
Temp. Range
Device Type Package
PY
Q
PG
Shrink Small Outline Package (SO20-7)
Quarter-size Small Outline Package (SO20-8)
Thin Shrink Small Outline Package (SO20-9)
3245
74
Low-Voltage Octal Bus Switch
–40°C to +85°C
CORPORATE HEADQUARTERS
2975StenderWay
Santa Clara, CA 95054
for SALES:
800-345-7015 or 408-727-6116
fax: 408-492-8674
for Tech Support:
logichelp@idt.com
(408) 654-6459
www.idt.com
5
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