Integrated Device Technology Inc. IDT71V256SA User Manual
IDT74FCT2245AT/CT
FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVER
INDUSTRIAL TEMPERATURE RANGE
FAST CMOS OCTAL
BIDIRECTIONAL
TRANSCEIVER
FEA TURES:
• A and C grades
• Low input and output leakage
• CMOS power levels
• True TTL input and output compatibility:
–VOH = 3.3V (typ.)
–VOL = 0.3V (typ.)
• Meets or exceeds JEDEC standard 18 specifications
• Resistor outputs -15mA IOH, 12mA IOL
• Reduced system switching noise
• Available in SOIC and QSOP packages
FUNCTIONAL BLOCK DIAGRAM
≤≤
≤1µA (max.)
≤≤
IDT74FCT2245AT/CT
DESCRIPTION:
The IDT octal bidirectional transceivers are built using an advanced dual
metal CMOS technology. The FCT2245T 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.
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
FCT2245T parts are plug-in replacements for FCT245T parts.
T/
R
OE
0
A
0
B
1
A
1
B
2
A
2
B
3
A
3
B
4
A
4
B
5
A
5
B
6
A
6
B
7
A
7
B
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
JUNE 2006INDUSTRIAL TEMPERATURE RANGE
1
© 2006 Integrated Device Technology, Inc. DSC-5511/6
IDT74FCT2245AT/CT
FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVER
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
T/R
A0
A1
A2
A3
A4
A5
A6
A7
GND
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
VCC
OE
B0
B1
2
B
B3
B4
B5
B6
B7
ABSOLUTE MAXIMUM RATINGS
Symbol Description Max Unit
(2)
VTERM
VTERM
TSTG Storage Temperature –65 to +150 °C
I
OUT DC Output Current –60 to +120 mA
NOTES:
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. No terminal voltage may exceed
Vcc by +0.5V unless otherwise noted.
2. Inputs and Vcc terminals only.
3. Output and I/O terminals only.
Terminal Voltage with Respect to GND –0.5 to +7 V
(3)
Terminal Voltage with Respect to GND –0.5 to VCC+0.5 V
(1)
CAPACITANCE (TA = +25°C, F = 1.0MHz )
Symbol Parameter
CIN Input Capacitance VIN = 0V 6 10 pF
C
OUT Output Capacitance VOUT = 0V 8 12 pF
NOTE:
1. This parameter is measured at characterization but not tested.
(1)
Conditions Typ. Max. Unit
SOIC/ QSOP
TOP VIEW
PIN DESCRIPTION
Pin Names Description
OE Output Enable Input (Active LOW)
T/R Transmit/Receive Input
A0 - A7 Side A Inputs or 3-State Outputs
B
0 - B7 Side BInputs or 3-State Outputs
FUNCTION TABLE
Inputs
OE T/R Outputs
L L Bus B Data to Bus A
L H Bus A Data to Bus B
H X High Z State
NOTE:
1. H = HIGH Voltage Level
X = Don’t Care
L = LOW Voltage Level
(1)
2
IDT74FCT2245AT/CT
FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVER
INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Industrial: TA = –40°C to +85°C, VCC = 5.0V ±5%
Symbol Parameter Test Conditions
(1)
Min. Typ.
VIH Input HIGH Level Guaranteed Logic HIGH Level 2 — — V
VIL Input LOW Level Guaranteed Logic LOW Level — — 0. 8 V
IIH Input HIGH Current
IIL Input LOW Current
OZH High Impedance Output Current VCC = Max. VI = 2.7V — — ±1µA
I
IOZL (3-State Output Pins)
II Input HIGH Current
(4)
(4)
(4)
(4)
VCC = Max. VI = 2.7V — — ±1µA
VCC = Max. VI = 0.5V — — ±1µA
VI = 0.5V — — ±1
VCC = Max., VI = VCC (Max.) — — ±1µA
VIK Clamp Diode Voltage VCC = Min., IIN = –18mA — –0.7 –1.2 V
VH Input Hysteresis — — 200 — mV
CC Quiescent Power Supply Current VCC = Max. — 0.01 1 mA
I
V
IN = GND or VCC
(2)
Max. Unit
OUTPUT DRIVE CHARACTERISTICS
Symbol Parameter Test Conditions
IODL Output LOW Current VCC = 5V, VIN = VIH or VIL, VOUT = 1.5V
IODH Output HIGH Current VCC = 5V, VIN = VIH or VIL, VOUT = 1.5V
(1)
(3)
(3)
Min. Typ.
16 48 — mA
-16 -48 — mA
VOH Output HIGH Voltage VCC = Min IOH = –15mA 2.4 3.3 — V
VIN = VIH or VIL
VOL Output LOW Voltage VCC = Min IOL = 12mA — 0.3 0.5 V
VIN = VIH or VIL
NOTES:
1. For conditions shown as Min. or Max., use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at VCC = 5.0V, +25°C ambient.
3. Not more than one output should be tested at one time. Duration of the test should not exceed one second.
4. The test limit for this parameter is ±5μA at TA = -55°C.
(2)
Max. Unit
3
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