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PDF IDT54FCT245TD Data sheet ( Hoja de datos )

Número de pieza IDT54FCT245TD
Descripción FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS
Fabricantes Integrated Device Technology 
Logotipo Integrated Device Technology Logotipo



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Integrated Device Technology, Inc.
FAST CMOS OCTAL
BIDIRECTIONAL
TRANSCEIVERS
IDT54/74FCT245T/AT/CT/DT - 2245T/AT/CT
IDT54/74FCT640T/AT/CT
IDT54/74FCT645T/AT/CT/DT
FEATURES:
• Common features:
– Low input and output leakage 1µA (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
– Product available in Radiation Tolerant and Radiation
Enhanced versions
– Military product compliant to MIL-STD-883, Class B
and DESC listed (dual marked)
– Available in DIP, SOIC, SSOP, QSOP, CERPACK
and LCC packages
• Features for FCT245T/FCT640T/FCT645T:
– Std., A, C and D speed grades
– High drive outputs (-15mA IOH, 64mA IOL)
• Features for FCT2245T:
– Std., A and C speed grades
– Resistor outputs (-15mA IOH, 12mA IOL Com.)
(-12mA IOH, 12mA IOL Mil.)
– Reduced system switching noise
DESCRIPTION:
The IDT octal bidirectional transceivers are built using an
advanced dual metal CMOS technology. The FCT245T/
FCT2245T, FCT640T and FCT645T are designed for asyn-
chronous 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.
The FCT245T/FCT2245T and FCT645T transceivers have
non-inverting outputs. The FCT640T has inverting outputs.
The FCT2245T has balanced drive outputs with current
limiting resistors. This offers low ground bounce, minimal
undershoot and controlled output fall times- reducing the need
for external series terminating resistors. The FCT2xxxT parts
are plug-in replacements for FCTxxxT parts.
FUNCTIONAL BLOCK DIAGRAM
PIN CONFIGURATIONS
T/R
OE
A0
B0
A1
B1
A2
B2
A3
B3
A4
B4
A5
B5
A6
B6
A7
B7
FCT245T/2245T, FCT645T are non-inverting options.
FCT640T is the inverting options.
2539 drw 01
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
MILITARY AND COMMERCIAL TEMPERATURE RANGES
©1995 Integrated Device Technology, Inc.
6.9
T/R
A0
A1
A2
A3
A4
A5
A6
A7
GND
1 20
2 19
3 P20-1 18
4 D20-1 17
5 SO20-2 16
SO20-7*
6 SO20-8** 15
7 & 14
8 E20-1 13
9 12
10 11
Vcc
OE
B0
B1
B2
B3
B4
B5
B6
B7
DIP/SOIC/SSOP/QSOP/CERPACK
TOP VIEW
*FCT245T/2245T, FCT645T only.
**FCT245T/2245T, FCT640T
INDEX
3 2 20 19
A2 4
1 18 B0
A3 5
17 B1
A4 6 L20-2 16 B2
A5 7
15 B3
A6 8
14 B4
9 10 11 12 13
2539 drw 02
LCC
TOP VIEW
2539 drw 03
AUGUST 1995
DSC-4611/4
1

1 page




IDT54FCT245TD pdf
IDT54/74FCT245T/AT/CT/DT - 2245T/AT/CT, IDT54/74FCT640T/AT/CT, IDT54/74FCT645T/AT/CT/DT
FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS
MILITARY AND COMMERCIAL TEMPERATURE RANGES
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
FCT245T
FCT2245T
Com'l.
Mil.
Symbol
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
tPZH
tPZL
tPHZ
tPLZ
Parameter
Propagation Delay
A to B, B to A
Output Enable Time
OE to A or B
Output Disable Time
OE to A or B
Output Enable Time
T/R to A or B(3)
Output Disable Time
T/R to A or B(3)
Conditions(1)
CL = 50 pF
RL = 500
Min.(2) Max. Min.(2) Max.
1.5 7.0 1.5 7.5
1.5 9.5 1.5 10.0
1.5 7.5 1.5 10.0
1.5 9.5 1.5 10.0
1.5 7.5 1.5 10.0
FCT245AT
FCT2245AT
Com'l.
Mil.
Min.(2) Max. Min.(2) Max.
1.5 4.6 1.5 4.9
Unit
ns
1.5 6.2 1.5 6.5 ns
1.5 5.0 1.5 6.0 ns
1.5 6.2 1.5 6.5 ns
1.5 5.0 1.5 6.0 ns
2534 tbl 09
Symbol
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
tPZH
tPZL
tPHZ
tPLZ
Parameter
Propagation Delay
A to B, B to A
Output Enable Time
OE to A or B
Output Disable Time
OE to A or B
Output Enable Time
T/R to A or B(3)
Output Disable Time
T/R to A or B(3)
Conditions(1)
CL = 50 pF
RL = 500
FCT245CT
FCT2245CT
Com'l.
Mil.
Min.(2) Max. Min.(2) Max.
1.5 4.1 1.5 4.5
FCT245DT
Com'l.
Mil.
Min.(2) Max. Min.(2) Max.
1.5 3.8 — —
Unit
ns
1.5 5.8 1.5 6.2 1.5 5.0 — — ns
1.5 4.8 1.5 5.2 1.5 4.3 — — ns
1.5 5.8 1.5 6.2 1.5 5.0 — — ns
1.5 4.8 1.5 5.2 1.5 4.3 — — ns
2534 tbl 10
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
FCT640T
FCT640AT
FCT640CT
Com'l. Mil. Com'l. Mil. Com'l. Mil.
Symbol
Parameter
Conditions(1) Min.(2) Max. Min.(2) Max. Min.(2) Max. Min.(2) Max. Min.(2) Max. Min.(2) Max. Unit
tPLH Propagation Delay
tPHL A to B, B to A
CL = 50 pF 2.0 7.0 2.0 8.0 1.5 5.0 1.5 5.3 1.5 4.4 1.5 4.7 ns
RL = 500
tPZH Output Enable Time
tPZL OE to A or B
2.0 13.0 2.0 16.0 1.5 6.2 1.5 6.5 1.5 5.8 1.5 6.2 ns
tPHZ Output Disable Time
tPLZ OE to A or B
2.0 10.0 2.0 12.0 1.5 5.0 1.5 6.0 1.5 4.8 1.5 5.2 ns
tPZH Output Enable Time
tPZL T/R to A or B(3)
2.0 13.0 2.0 16.0 1.5 6.2 1.5 6.5 1.5 5.8 1.5 6.2 ns
tPHZ Output Disable Time
tPLZ T/R to A or B(3)
2.0 10.0 2.0 12.0 1.5 5.0 1.5 6.0 1.5 4.8 1.5 5.2 ns
NOTES:
1. See test circuit and waveforms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
3. This parameter is guaranteed but not tested.
2534 tbl 11
6.9 5

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