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PDF IDT74LVCH245A Data sheet ( Hoja de datos )
| Número de pieza | IDT74LVCH245A | |
| Descripción | 3.3V CMOS OCTAL BUS TRANSCEIVER | |
| Fabricantes | Integrated Device Technology | |
| Logotipo |  |
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IDT74LVCH245A
3.3V CMOS OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUTS
INDUSTRIALTEMPERATURERANGE
3.3V CMOS OCTAL BUS
TRANSCEIVER WITH 3-STATE
OUTPUTS, 5 VOLT TOLERANT I/O
AND BUS-HOLD
IDT74LVCH245A
FEATURES:
• 0.5 MICRON CMOS Technology
• ESD > 2000V per MIL-STD-883, Method 3015; > 200V using
machine model (C = 200pF, R = 0)
• VCC = 3.3V ± 0.3V, Normal Range
• VCC = 2.7V to 3.6V, Extended Range
• CMOS power levels (0.4µ W typ. static)
www.Data•ShReeati4l-Uto.c-roamil output swing for increased noise margin
• All inputs, outputs, and I/O are 5V tolerant
• Supports hot insertion
• Available in SOIC, SSOP, QSOP, and TSSOP packages
DRIVE FEATURES:
• High Output Drivers: ±24mA
• Reduced system switching noise
APPLICATIONS:
• 5V and 3.3V mixed voltage systems
• Data communication and telecommunication systems
DESCRIPTION:
The LVCH245A octal bus transceiver is built using advanced dual metal
CMOS technology. The device is designed for asynchronous communi-
cation between data buses. Data is transmitted from the A bus to the B bus
or from the B bus to the A bus, depending upon the logic level at the direction-
control (DIR) input. The output-enable (OE) input can be used to disable
the device so the buses are effectively isolated.
The LVCH245A has been designed with a ±24mA output driver. This
driver is capable of driving a moderate to heavy load while maintaining
speed performance.
The LVCH245A has “bus-hold” which retains the inputs’ last state
whenever the input goes to a high-impedance. This prevents floating
inputs and eliminates the need for pull-up/down resistors.
Inputs can be driven from either 3.3V or 5V devices. This feature allows
the use of this device as a translator in a mixed 3.3V/5V system environ-
ment.
FUNCTIONAL BLOCK DIAGRAM
DIR 1
A1 2
19 OE
18
B1
TO SEVEN OTHER CHANNELS
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
© 1999 Integrated Device Technology, Inc.
1
OCTOBER 1999
DSC-4611/1
1 page  
IDT74LVCH245A
3.3V CMOS OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUTS
INDUSTRIALTEMPERATURERANGE
TEST CIRCUITS AND WAVEFORMS
TEST CONDITIONS
Symbol VCC(1)= 3.3V±0.3V VCC(1)= 2.7V
VLOAD
6
6
VIH 2.7
2.7
VT 1.5
1.5
VLZ 300
300
VHZ 300
300
CL 50
50
VCC(2)= 2.5V±0.2V
2 x Vcc
Vcc
Vcc / 2
150
150
30
Unit
V
V
V
mV
mV
pF
www.DataSheet4U.com
VCC
VLOAD
Open
VIN
Pulse (1, 2)
Generator
VOUT
D.U.T.
500Ω GND
RT
500Ω
CL
Test Circuit for All Outputs
LVC Link
DEFINITIONS:
CL = Load capacitance: includes jig and probe capacitance.
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.
SAME PHASE
INPUT TRANSITION
OUTPUT
tPLH
OPPOSITE PHASE
INPUT TRANSITION
tPLH
tPHL
tPHL
Propagation Delay
VIH
VT
0V
VOH
VT
VOL
VIH
VT
0V
LVC Link
CONTROL
INPUT
ENABLE
tPZL
DISABLE
tPLZ
OUTPUT
NORMALLY
LOW
SWITCH
VLOAD
tPZH
OUTPUT SWITCH
NORMALLY GND
HIGH
VLOAD/2
VT
tPHZ
VT
0V
VIH
VT
0V
VLOAD/2
VOL+VLZ
VOL
VOH
VOH-VHZ
0V
LVC Link
Enable and Disable Times
NOTE:
1. Diagram shown for input Control Enable-LOW and input Control Disable-HIGH.
SWITCH POSITION
Test
Open Drain
Disable Low
Enable Low
Disable High
Enable High
All Other Tests
Switch
VLOAD
GND
Open
INPUT
OUTPUT 1
OUTPUT 2
tPLH1
tPHL1
tSK (x)
tSK (x)
VIH
VT
0V
VOH
VT
VOL
VOH
VT
VOL
tPLH2
tPHL2
tSK(x) = tPLH2 - tPLH1 or tPHL2 - tPHL1
Output Skew - tSK(X)
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.
DATA
INPUT
TIMING
INPUT
ASYNCHRONOUS
CONTROL
SYNCHRONOUS
CONTROL
tSU tH
tREM
tSU tH
Set-up, Hold, and Release Times
VIH
VT
0V
VIH
VT
0V
VIH
VT
0V
VIH
VT
0V
LVC Link
LOW-HIGH-LOW
PULSE
tW
HIGH-LOW-HIGH
PULSE
Pulse Width
VT
VT
LVC Link
5
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet IDT74LVCH245A.PDF ] | |
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