74LVC245ASO8 [IDT]
SOIC-20, Reel;
| 型号： | 74LVC245ASO8 |
| 厂家： | 
INTEGRATED DEVICE TECHNOLOGY |
| 描述： | SOIC-20, Reel |
| 文件： | 总6页 (文件大小：116K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
3.3V CMOS
OCTAL BUS TRANSCEIVER
WITH 3-STATE OUTPUTS
AND 5 VOLT TOLERANT I/O
IDT74LVC245A
ADVANCE
INFORMATION
DESCRIPTION:
FEATURES:
–
–
0.5 MICRON CMOS Technology
This octal bus transceiver is built using advanced dual metal CMOS
technology.This high-speed,lowpowertransceiveris idealforasynchro-
nouscommunicationbetweentwobusses(AandB).Thedirectioncontrol
pin(DIR)controls the directionofdata flow. The outputenable pin(OE)
overrides the direction control and disables both ports. All inputs are
designedwithhysteresis forimprovednoise margin.
ESD > 2000V per MIL-STD-883, Method 3015;
> 200V using machine model (C = 200pF, R = 0)
1.27mm pitch SOIC, 0.65mm pitch SSOP,
0.635mm pitch QSOP, 0.65mm pitch TSSOP packages
Extended commercial range of – 40°C to +85°C
VCC = 3.3V ±0.3V, Normal Range
–
–
–
–
–
–
–
–
V
CC
= 2.3V to 3.6V, Extended Range
The LVC245A has been designed with a ±24mA output driver. This
driver is capable of driving a moderate to heavy load while maintaining
speedperformance.
CMOS power levels (0.4µW typ. static)
Rail-to-Rail output swing for increased noise margin
All inputs, outputs and I/O are 5 Volt tolerant
Supports hot insertion
Allpinscanbedrivenfromeither3.3Vor5Vdevices. Thisfeatureallows
the use of this device as a translator in a mixed 3.3V/5V supply system.
Drive Features for LVC245A:
–
–
High Output Drivers: ±24mA
Reduced system switching noise
APPLICATIONS:
• 5V and 3.3V mixed voltage systems
• Data communication and telecommunication systems
FunctionalBlockDiagram
1
DIR
19
OE
2
A1
18
B1
3
A2
17
2
B
4
A3
16
15
B3
5
A4
4
B
6
A5
14
13
B5
B6
7
A6
8
A7
12
B7
B8
9
A8
11
EXTENDED COMMERCIAL TEMPERATURE RANGE
APRIL 1999
1
c
1999 Integrated Device Technology, Inc.
DSC-4496/-
IDT74LVC245A
EXTENDEDCOMMERCIALTEMPERATURERANGE
3.3VCMOSOCTALBUSTRANSCEIVERWITH3-STATEOUTPUTS
ABSOLUTE MAXIMUM RATINGS (1)
PINCONFIGURATION
Symbol
Description
Max.
Unit
V
(2)
VTERM
Terminal Voltage with Respect to GND
Terminal Voltage with Respect to GND
Storage Temperature
– 0.5 to +6.5
– 0.5 to +6.5
20
19
18
17
16
15
14
13
12
11
1
2
VCC
OE
B1
B2
B3
B4
B5
B6
B7
B8
DIR
A1
A2
(3)
VTERM
V
TSTG
IOUT
– 65 to +150 °C
DC Output Current
– 50 to +50
– 50
mA
mA
3
4
IIK
Continuous Clamp Current,
VI < 0 or VO < 0
A3
IOK
ICC
SO20-2
SO20-7
SO20-8
SO20-9
Continuous Current through
±100
mA
A4
A5
5
ISS
each VCC or GND
6
8LVC
NOTES:
A6
A7
7
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.
2. VCC terminals.
8
A8
9
GND
10
3. All terminals except VCC.
SOIC/ SSOP/ QSOP/ TSSOP
TOP VIEW
CAPACITANCE
(TA = +25°C, f = 1.0MHZ)
Symbol
Parameter(1)
Conditions
Typ.
Max. Unit
CIN
Input Capacitance
VIN = 0V
4.5
6
pF
COUT
CI/O
Output
Capacitance
I/O Port
VOUT = 0V
VIN = 0V
5.5
6.5
8
pF
8
pF
Capacitance
8LVC Link
NOTE:
1. As applicable to the device type.
PIN DESCRIPTION
Pin Names
Description
OE
DIR
Ax
Output Enable Input (Active LOW)
Direction Control Input
Side A Inputs or 3-State Outputs
Side B Inputs or 3-State Outputs
Bx
FUNCTION TABLE (1)
Inputs
OE
L
DIR
L
Outputs
Bus B Data to Bus A
L
H
Bus A Data to Bus B
High Z State
H
X
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
Z = High-Impedance
2
IDT74LVC245A
EXTENDEDCOMMERCIALTEMPERATURERANGE
3.3VCMOSOCTALBUSTRANSCEIVERWITH3-STATEOUTPUTS
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Operating Condition: TA = – 40°C To +85°C
Symbol
Parameter
Test Conditions
Min.
Typ.(1)
Max.
Unit
VIH
Input HIGH Voltage Level
VCC = 2.3V to 2.7V
VCC = 2.7V to 3.6V
VCC = 2.3V to 2.7V
VCC = 2.7V to 3.6V
VCC = 3.6V
1.7
—
—
V
2
—
—
—
—
—
0.7
0.8
±5
VIL
Input LOW Voltage Level
Input Leakage Current
—
—
—
V
IIH
VI = 0 to 5.5V
µA
µA
IIL
IOZH
High Impedance Output Current
(3-State Output pins)
VCC = 3.6V
VO = 0 to 5.5V
—
—
±10
IOZL
IOFF
VIK
VH
Input/Output Power Off Leakage
Clamp Diode Voltage
VCC = 0V, VIN or VO ≤ 5.5V
VCC = 2.3V, IIN = – 18mA
VCC = 3.3V
—
—
—
—
—
– 0.7
100
—
±50
– 1.2
—
µA
V
Input Hysteresis
mV
µA
ICCL
ICCH
ICCZ
Quiescent Power Supply Current
VCC = 3.6V
VIN = GND or VCC
10
(2)
—
—
—
—
10
3.6 ≤ VIN ≤ 5.5V
∆ICC
Quiescent Power Supply
Current Variation
One input at VCC - 0.6V,
other inputs at VCC or GND
500
µA
8LVC Link
NOTES:
1. Typical values are at VCC = 3.3V, +25°C ambient.
2. This applies in the disabled state only.
OUTPUT DRIVE CHARACTERISTICS
Symbol
Parameter
Output HIGH Voltage
Test Conditions(1)
Min.
Max.
Unit
VOH
VCC = 2.3V to 3.6V
VCC = 2.3V
IOH = – 0.1mA
IOH = – 6mA
IOH = – 12mA
VCC – 0.2
2
—
—
V
VCC = 2.3V
1.7
2.2
2.4
2.2
—
—
VCC = 2.7V
—
VCC = 3.0V
—
VCC = 3.0V
IOH = – 24mA
IOL = 0.1mA
IOL = 6mA
—
VOL
Output LOW Voltage
VCC = 2.3V to 3.6V
VCC = 2.3V
0.2
0.4
0.7
0.4
0.55
V
—
IOL = 12mA
IOL = 12mA
IOL = 24mA
—
VCC = 2.7V
VCC = 3.0V
—
—
8LVC Link
NOTE:
1. VIH and VIL must be within the min. or max. range shown in the DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE table for the
appropriate VCC range. TA = – 40°C to +85°C.
3
IDT74LVC245A
EXTENDEDCOMMERCIALTEMPERATURERANGE
3.3VCMOSOCTALBUSTRANSCEIVERWITH3-STATEOUTPUTS
OPERATING CHARACTERISTICS, T = 25°C
A
VCC = 2.5V±0.2V
VCC = 3.3V±0.3V
Unit
Symbol
Parameter
Test Conditions
Typical
Typical
CPD
Power dissipation capacitance per transceiver outputs enabled
CL = 0pF, f = 10Mhz
—
47
pF
pF
CPD
Power dissipation capacitance per transceiver outputs disabled
—
2
SWITCHING CHARACTERISTICS (1)
VCC = 2.5V±0.2V
VCC = 2.7V
VCC = 3.3V±0.3V
Symbol
tPLH
Parameter
Propagation Delay
Ax to Bx, Bx to Ax
Output Enable Time
OE to Ax or Bx
Min.
Max.
Min.
Max.
Min.
Max.
Unit
—
—
—
7.3
1.5
1.5
1.7
—
6.3
ns
tPHL
tPZH
—
—
—
—
—
—
—
—
—
9.5
8.5
—
8.5
7.5
1
ns
tPZL
tPHZ
Output Disable Time
OE to Ax or Bx
ns
ns
tPLZ
tSK(o) Output Skew (2)
NOTES:
1. See test circuits and waveforms. TA = – 40°C to + 85°C.
2. Skew between any two outputs of the same package and switching in the same direction.
4
IDT74LVC245A
EXTENDEDCOMMERCIALTEMPERATURERANGE
3.3VCMOSOCTALBUSTRANSCEIVERWITH3-STATEOUTPUTS
TESTCIRCUITSANDWAVEFORMS
PROPAGATIONDELAY
TESTCONDITIONS
Symbol
VIH
VT
0V
(1)
(1)
(2)
VCC = 3.3V ±0.3V VCC = 2.7V VCC = 2.5V ±0.2V
Unit
SAME PHASE
VLOAD
6
6
2 xVcc
Vcc
V
INPUT TRANSITION
tPHL
tPLH
VIH
VT
2.7
1.5
300
300
50
2.7
1.5
300
300
50
V
V
VOH
VT
VOL
OUTPUT
VCC / 2
150
VLZ
VHZ
CL
mV
mV
tPHL
tPLH
VIH
VT
0V
150
OPPOSITE PHASE
INPUT TRANSITION
30
pF
8LVC Link
LVC Link
TEST CIRCUITS FOR ALL OUTPUTS
ENABLEANDDISABLETIMES
VLOAD
VCC
DISABLE
ENABLE
VIH
VT
Open
GND
CONTROL
INPUT
500Ω
500Ω
0V
tPZL
tPLZ
VIN
VOUT
Pulse (1, 2)
Generator
D.U.T.
VLOAD/2
VT
VLOAD/2
OUTPUT
NORMALLY
LOW
SWITCH
CLOSED
VOL+VLZ
VOL
RT
tPHZ
tPZH
CL
VOH
VOH-VHZ
OUTPUT
NORMALLY
HIGH
SWITCH
OPEN
VT
0V
LVC Link
0V
DEFINITIONS:
CL= Load capacitance: includes jig and probe capacitance.
LVC Link
RT = Termination resistance: should be equal to ZOUT of the Pulse
NOTE:
Generator.
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.
SET-UP, HOLD, AND RELEASE TIMES
SWITCHPOSITION
VIH
VT
0V
DATA
INPUT
Test
Switch
tSU
tH
Open Drain
Disable Low
Enable Low
Disable High
Enable High
All Other tests
V
LOAD
VIH
VT
0V
TIMING
INPUT
tREM
VIH
VT
0V
GND
Open
ASYNCHRONOUS
CONTROL
VIH
VT
0V
SYNCHRONOUS
CONTROL
8LVC Link
tSU
tH
OUTPUT SKEW - tsk (x)
VIH
LVC Link
VT
0V
INPUT
PULSEWIDTH
tPLH1
tPHL1
VOH
VT
LOW-HIGH-LOW
PULSE
OUTPUT 1
OUTPUT 2
VOL
VT
tSK (x)
tSK (x)
VOH
tW
VT
HIGH-LOW-HIGH
PULSE
VT
VOL
LVC Link
tPLH2
tSK(x) = tPLH2 - tPLH1 or tPHL2 - tPHL1
tPHL2
LVC Link
NOTES:
1. For tSK(o) OUTPUT1 and OUTPUT2 are any two outputs.
2. For tSK(b) OUTPUT1 and OUTPUT2 are in the same bank.
5
IDT74LVC245A
EXTENDEDCOMMERCIALTEMPERATURERANGE
3.3VCMOSOCTALBUSTRANSCEIVERWITH3-STATEOUTPUTS
ORDERINGINFORMATION
IDT
XX
LVC
X
XXXX
XX
Temp. Range
Bus-Hold Device Type Package
Small Outline IC (gull wing) (SO20-2)
SO
PY
Q
Shrink Small Outline Package (SO20-7)
Quarter Size Small Outline Package (SO20-8)
Thin Shrink Small Outline Package (SO20-9)
PG
245A
Octal Bus Transceiver with 3-State Outputs, ±24mA
Blank
74
No Bus-hold
–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
www.idt.com*
*To search for sales office near you, please click the sales button found on our home page or dial the 800# above and press 2.
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
6
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DIODES
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