PI74FCT245T/640T/645T
PI74FCT2245T/2640T/2645T (25Ω Series)
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Fast CMOS Octal
Bidirectional Transceivers
ProductFeatures
•PI74FCT245/640/645TandPI74FCT2245/2640T/2645Tarepin compatible with bipolar FAST™ Series at a higher speed and lower power consumption
•25 Ohm series resistor on all outputs (FCT2XXX only)
•TTL input and output levels
•Low ground bounce outputs
•Extremely low static power
•Hysteresis on all inputs
•Industrial operating temperature range: –40°C to +85°C
•Packages available:
–20-pin 173 mil wide plastic TSSOP (L)
–20-pin 300 mil wide plastic DIP (P)
–20-pin 150 mil wide plastic QSOP (Q)
–20-pin 150 mil wide plastic TQSOP (R)
–20-pin 300 mil wide plastic SOIC (S)
–20-pin 209 mil wide plastic SSOP (H)
•Device models available on request
Logic Block Diagram
T/R
OE
A0
B0
A1
B1
A2
B2
A3
B3
A4
B4
A5
B5
A6
B6
A7
B7
FCT245, 2245, 645, 2645 are non-inverting options.
FCT640 & FCT2640 are inverting options.
ProductDescription
Pericom Semiconductor’s PI74FCT series of logic circuits are produced using the Company’s advanced 0.6/0.8 micron CMOS technology, achieving industry leading speed grades. All PI74FCT2XXX devices have a built-in 25 Ohm series resistor on all outputs to reduce noise because of reflections, thus eliminating the need for an external terminating resistor.
ThePI74FCT245T/640T/645TandPI74FCT2245T/2640T/2645Tare 8-bit wide octal buffer bidirectional transceivers designed for asynchronous two-way communication between data buses. The transmit/receive (T/R) input determines the direction of data flow throughthebidirectionaltransceiver.Transmit(activeHIGH)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.
ProductPinConfiguration
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T/R |
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Vcc |
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1 |
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20 |
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A0 |
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2 |
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19 |
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OE |
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A1 |
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3 |
20-Pin |
18 |
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B0 |
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A2 |
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17 |
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B1 |
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4 |
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A3 |
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L,P,Q |
16 |
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B2 |
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5 |
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A4 |
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R,S,H |
15 |
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B3 |
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6 |
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A5 |
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14 |
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B4 |
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7 |
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A6 |
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8 |
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13 |
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B5 |
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A7 |
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12 |
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B6 |
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9 |
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GND |
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11 |
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B7 |
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10 |
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ProductPinDescription
PinName |
Description |
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3-State Output Enable Inputs (Active LOW) |
OE |
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T/R |
Transmit/Receive Input |
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A0-A7 |
Side A Inputs or 3-State Outputs |
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B0-B7 |
Side B Inputs or 3-State Outputs |
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GND |
Ground |
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VCC |
Power |
TruthTable(1)
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Inputs |
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OE |
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T/R |
Outputs |
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L |
L |
Bus B Data to Bus A(2) |
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L |
H |
Bus A Data to Bus B(2) |
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H |
X |
High Z State |
1.H = High Voltage Level, X = Don't Care, L = Low Voltage Level, Z = High Impedance
2.640 is inverting from input to output.
1 |
PS2012B |
09/22/99 |
PI74FCT245T/640T/645T 25 Ohm Series PI74FCT2245T/2640T/2645T OctalBidirectionalTransceivers
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MaximumRatings
(Above which the useful life may be impaired. For user guidelines, not tested.)
....................................................................Storage Temperature |
–65°Cto+150°C |
Ambient Temperature with Power Applied .................................... |
–40°Cto+85°C |
Supply Voltage to Ground Potential (Inputs & VCC Only) ............. |
–0.5Vto+7.0V |
Supply Voltage to Ground Potential (Outputs & D/O Only) ........... |
–0.5Vto+7.0V |
DC Input Voltage ............................................................................ |
–0.5Vto+7.0V |
DC Output Current ...................................................................................... |
120mA |
Power Dissipation .......................................................................................... |
0.5W |
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Note:
Stresses greater than those listed under 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.
DC Electrical Characteristics (Over the Operating Range, TA = –40°C to +85°C, V CC = 5.0V ±5%)
Parameters |
Description |
Test Conditions(1) |
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Min. |
Typ(2) |
Max. |
Units |
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VOH |
Output HIGH Voltage |
VCC = Min., VIN = VIH or VIL |
IOH = –15.0mA |
2.4 |
3.0 |
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V |
VOL |
Output LOW Current |
VCC = Min., VIN = VIH or VIL |
IOL = 64mA |
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0.3 |
0.55 |
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V |
VOL |
Output LOW Current |
VCC = Min., VIN = VIH or VIL |
IOL = 12mA (25Ω Series) |
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0.3 |
0.50 |
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V |
VIH |
Input HIGH Voltage |
Guaranteed Logic HIGH Level |
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2.0 |
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V |
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VIL |
Input LOW Voltage |
Guaranteed Logic LOW Level |
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0.8 |
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V |
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IIH |
Input HIGH Current |
(Except I/O pins) VCC = Max. |
VIN = VCC |
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1 |
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µA |
IIL |
Input LOW Current |
(Except I/O pins) VCC = Max. |
VIN = GND |
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–1 |
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µA |
IIH |
Input HIGH Current |
(I/O pins Only) VCC = Max. |
VIN = VCC |
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1 |
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µA |
IIL |
Input LOW Current |
(I/O pins Only) VCC = Max. |
VIN = GND |
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–1 |
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µA |
IOZH |
High Impedance |
VCC = MAX. |
VOUT = 2.7V |
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1 |
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µA |
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IOZL |
Output Current |
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VOUT = 0.5V |
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–1 |
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µA |
VIK |
Clamp Diode Voltage |
VCC = Min., IIN = –18 mA |
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–0.7 |
–1.2 |
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V |
IOFF |
Power Down Disable |
VCC = GND, VOUT = 4.5V |
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— |
— 100 |
µA |
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IOS |
Short Circuit Current |
VCC = Max.(3), VOUT = GND |
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–60 |
–120 |
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mA |
VH |
Input Hysteresis |
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200 |
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mV |
Capacitance(TA = 25°C, f = 1 MHz)
Parameters(4) |
Description |
TestConditions |
Typ. |
Max. |
Units |
CIN |
Input Capacitance |
VIN =0V |
6 |
10 |
pF |
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COUT |
Output Capacitance |
VOUT = 0V |
8 |
12 |
pF |
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Notes:
1.For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device type.
2.Typical values are at VCC = 5.0V, +25°C ambient and maximum loading.
3.Not more than one output should be shorted at one time. Duration of the test should not exceed one second.
4.This parameter is determined by device characterization but is not production tested.
2 |
PS2012B |
09/22/99 |