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PDF IDT74FCT645CT Data sheet ( Hoja de datos )
| Número de pieza | IDT74FCT645CT | |
| Descripción | (IDT74FCT645xT) FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVER | |
| Fabricantes | IDT | |
| Logotipo |  |
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IDT74FCT645T/AT/CT/DT
FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVER
FAST CMOS OCTAL
BIDIRECTIONAL
TRANSCEIVER
INDUSTRIALTEMPERATURERANGE
IDT74FCT645T/AT/CT/DT
FEATURES:
− Low input and output leakage ≤1µ A (max.)
− CMOS power levels
− True TTL input and output compatibility
• VOH = 3.3V (typ.)
• VOL = 0.3V (typ.)
− Meets or exceeds JEDEC standard 18 specifications
− Available in SOIC, and SSOP packages
− Std., A, C and D speed grades
− High drive outputs (-15mA IOH, 64mA IOL)
DESCRIPTION:
The IDT octal bidirectional transceivers are built using an advanced dual
metal CMOS technology. The FCT645T is designed for asynchronous two-
way communication between data buses. The transmit/receive (T/R) input
determines the direction of data flow through the bidirectional transceiver.
Transmit (active high) enables data from A ports to B ports, and receive
(active low) from B ports to A ports. The output enable (OE) input, when
high, disables both A and B ports by placing them in high Z condition.
FUNCTIONAL BLOCK DIAGRAM
T/R
A0
A1
A2
A3
A4
A5
A6
A7
INDUSTRIAL TEMPERATURE RANGE
c 1999 Integrated Device Technology, Inc.
1
OE
B0
B1
B2
B3
B4
B5
B6
B7
AUGUST 2000
DSC-5512/-
1 page  
IDT74FCT645T/AT/CT/DT
FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVER
INDUSTRIALTEMPERATURERANGE
TEST CIRCUITS AND WAVEFORMS
TEST CIRCUITS FOR ALL OUTPUTS
V CC
7.0V
Pulse
Generator
V IN
D.U.T.
RT
V OUT
50pF
CL
500Ω
500Ω
O ctal lin k
SWITCH POSITION
Test
Open Drain
Disable Low
Enable Low
All Other Tests
Switch
Closed
Open
DEFINITIONS:
CL = Load capacitance: includes jig and probe capacitance.
RT = Termination resistance: should be equal to ZOUT of the Pulse
Generator.
8-link
SET-UP, HOLD, AND RELEASE TIMES
DATA
INPUT
TIMING
INPUT
tSU tH
ASYNCHRONOUS CONTROL
PRESET
tREM
CLEAR
ETC.
SYNCHRONOUS CONTROL
PRESET
CLEAR
CLOCK ENABLE
tSU tH
ETC.
3V
1.5V
0V
3V
1.5V
0V
3V
1.5V
0V
3V
1.5V
0V
O ctal lin k
PULSE WIDTH
LO W -HIGH-LOW
PULSE
H IG H -L O W -H IG H
PULSE
1.5V
tW
1.5V
O ctal lin k
PROPAGATION DELAY
SAME PHASE
INPUT TRANSITION
OUTPUT
OPPOSITE PHASE
INPUT TRANSITION
tPLH
tPLH
tPHL
tPHL
3V
1.5V
0V
VOH
1.5V
VOL
3V
1.5V
0V
O ctal lin k
ENABLE AND DISABLE TIMES
ENABLE
CONTROL
INPUT
OUTPUT
NORMALLY
LOW
tPZL
S W IT C H
CLOSED
tPZH
OUTPUT
NORMALLY
HIGH
S W IT C H
OPEN
DISABLE
3V
1.5V
tPLZ
0V
3.5V
3.5V
1.5V
tPHZ
0.3V VOL
1.5V
0.3V VOH
0V 0V
O ctal lin k
NOTES:
1. Diagram shown for input Control Enable-LOW and input Control Disable-
HIGH
2. Pulse Generator for All Pulses: Rate ≤ 1.0MHz; tF ≤ 2.5ns; tR ≤ 2.5ns
5
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet IDT74FCT645CT.PDF ] | |
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