IDT29FCT2052AT/BT/CT
FAST CMOS OCTAL REGISTERED TRANSCEIVER
INDUSTRIAL TEMPERATURE RANGE
FAST CMOS
OCTAL REGISTERED
TRANSCEIVER
IDT29FCT2052AT/BT/CT
FEATURES:
DESCRIPTION:
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The IDT29FCT2052T is an 8-bit registered transceiver built using an
advanced dual metal CMOS technology. Two 8-bit back-to-back registers
store data flowing in both directions between two bidirectional buses.
Separate clock, clock enable and 3-state output enable signals are provided
for each register. Both A outputs and B outputs are guaranteed to sink 64mA.
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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
A, B and C speed grades
Resistor outputs
(-15mA IOH, 12mA IOL)
Reduced system switching noise
Available in SOIC and QSOP packages
The IDT29FCT2052T 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 IDT29FCT2052T is a plug-in replacement for the IDT29FCT52T.
FUNCTIONAL BLOCK DIAGRAM
CPA
CEA
OEB
A0
D 0 CE
A1
D1
A2
D2
A3
D3
A4
CP
Q0
B0
Q1
B1
Q2
B2
Q3
B3
D4
Q4
B4
A5
D5
Q5
B5
A6
D6
Q6
B6
A7
D7
Q7
B7
Q0
D0
Q1
D1
Q2
Q3
A
Reg.
B
Reg.
D2
D3
Q4
D4
Q5
D5
Q6
D6
Q 7 CE
CP D 7
CPB
OEA
CEB
INDSUTRIAL TEMPERATURE RANGE
AUGUST 2000
1
c
1999 Integrated Device Technology, Inc.
DSC-5482/-
IDT29FCT2052AT/BT/CT
FAST CMOS OCTAL REGISTERED TRANSCEIVER
INDUSTRIAL TEMPERATURE RANGE
PIN DESCRIPTION
Name
I/O
Description
A0-7
I/O
Eight bidirectional lines carrying the A Register inputs or B Register outputs.
B0-7
I/O
Eight bidirectional lines carrying the B Register inputs or A Register outputs.
CPA
I
Clock for the A Register. When CEA is LOW, data is entered into the A Register on the LOW-to-HIGH transition of the CPA signal.
CEA
I
Clock Enable for the A Register. When CEA is LOW, data is entered into the A Register on the LOW-to-HIGH transition of the CPA signal. When
CEA is HIGH, the A Register holds its contents, regardless of CPA signal transitions.
OEB
I
Output Enable for the A Register. When OEB is LOW, the A Register outputs are enabled onto the B0-7 lines. When OEB is HIGH, the B0-7 outputs
are in the high-impedance state.
CPB
I
Clock for the B Register. When CEB is LOW, data is entered into the B Register on the LOW-to-HIGH transition of the CPB signal.
CEB
I
Clock Enable for the B Register. When CEB is LOW, data is entered into the B Register on the LOW-to-HIGH transition of the CPB signal. When
CEB is HIGH, the B Register holds its contents, regardless of CPB signal transitions.
OEA
I
Output Enable for the B Register. When OEA is LOW, the B Register outputs are enabled onto the A0-7 lines. When OEA is HIGH, the A0-7 outputs
are in the high-impedance state.
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Industrial: TA = -40°C to +85°C, VCC = 5.0V ± 5%
Symbol
VIH
Parameter
Input HIGH Level
Test Conditions(1)
Guaranteed Logic HIGH Level
VIL
Input LOW Level
Guaranteed Logic LOW Level
Input HIGH
Current(4)
IIL
Input LOW
Current(4)
IOZH
High Impedance Output Current
IIH
IOZL
(3-State Output
II
Input HIGH
VIK
Clamp Diode Voltage
VH
Quiescent Power Supply Current
Max.
—
Unit
V
—
—
0.8
V
µA
VI = 2.7V
—
—
±1
VI = 0.5V
—
—
±1
VCC = Max.
VO = 2.7V
—
—
±1
VO = 0.5V
—
—
±1
Input Hysteresis
ICC
Typ.(2)
—
VCC = Max.
pins)(4)
Current(4)
Min.
2
VCC = Max., VI = VCC (Max.)
—
—
±1
µA
VCC = Min., IIN = –18mA
—
–0.7
–1.2
V
—
200
—
mV
—
0.01
1
mA
—
VCC = 3V, VIN = GND or VCC
OUTPUT DRIVE CHARACTERISTICS
Symbol
IODL
Parameter
Output LOW Current
Test Conditions(1)
VCC = 5V, VIN = VIH or VIL, VOUT = 1.5V(3)
Min.
16
Typ.(2)
48
Max.
—
Unit
mA
IODH
Output HIGH Current
VCC = 5V, VIN = VIH or VIL, VOUT = 1.5V(3)
–16
–48
—
mA
VOH
Output HIGH Voltage
VCC = Min.
IOH = -15mA
2.4
3.3
—
V
VOL
Output LOW Voltage
VCC = Min.
IOL = 12mA
—
0.3
0.5
V
VIN = VIH or VIL
VIN = VIH or VIL
NOTES:
1. For conditions shown as Max. or Min., 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 shorted at one time. Duration of the short circuit test should not exceed one second.
4. The test limit for this parameter is ±5µA at TA = -55°C.
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