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PI74FCT373T
PI74FCT573T
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Octal Transparent Latches
Fast CMOS Octal
Transparent Latches
Features:
• PI74FCT373/573T are pin compatible with bipolar FAST™
Series at a higher speed and lower power consumption
• 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
• Device models available upon request
• Packaging:
– 20-pin TSSOP (L)
– 20-pin SSOP (H)
– 20-pin QSOP (Q)
– 20-pin SOIC (S)
Block Diagram
D0
D
D1
D
O
G
D2
D
O
G
D3
O
G
Description:
Pericom Semiconductor’s PI74FCT373T and PI74FCT 573T are
8-bit wide octal transparent latches designed with 3-state outputs
and are intended for bus oriented applications. When Latch Enable
(LE) is HIGH, the flip-flops appear transparent to the data. The data
that meets the set-up time when LE is LOW is latched. When OE is
HIGH, the bus output is in the high impedance state.
D4
D
O
G
D
D5
D
O
G
D6
D
O
G
D7
D
O
G
O
G
LE
OE
O0
O1
O2
O3
1
O4
O5
O6
O7
PS2015B 10/06/04
PI74FCT373T
PI74FCT573T
OCTAL TRANSPARENT LATCHES
PI74FCT373 Pin Configuration
1
OE
O
0
2
D
0
3
4
5
6
7
8
9
10
20-PIN
L20
P20
Q20
S20
D
O
O
D
D
O
GND
1
1
2
2
3
3
PI74FCT573 Pin Configuration
1
OE
0
D
2
3
4
5
6
7
8
9
10
20-PIN
L20
P20
Q20
S20
D
D
D
D
D
D
D
GND
1
2
3
4
5
6
7
20
19
18
17
16
15
14
13
12
11
20
19
18
17
16
15
14
13
12
11
Vcc
O
7
D
7
D
6
O
6
O
5
D
5
D
4
O
4
LE
Vcc
O
0
O
1
O
2
O
3
O
4
O
5
O
6
O
7
LE
Pin Description
Pin Name Description
OE Output Enable Input (Active LOW)
LE Latch Enable Input (Active HIGH)
D0-D7 Data Inputs
O0-O7 3-State Outputs
O0-O7 Complementary 3-State Outputs
GND Ground
VCC Power
Truth Table
DN LE OE ON
HHLH
LHLL
XXHZ
1. H = High Voltage Level
L = Low Voltage Level
X = Don’t Care
Z = High Impedance
(1)
Inputs Outputs
2
PS2015B 10/06/04
PI74FCT373T
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PI74FCT573T
OCTAL TRANSPARENT LATCHES
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
Storage Temperature ................................................................. –65°C to +150°C
Ambient Temperature with Power Applied ................................. -40°C to +85°C
Supply Voltage to Ground Potential (Inputs & Vcc Only) .......... –0.5V to +7.0V
Supply Voltage to Ground Potential (Outputs & D/O Only) ....... –0.5V to +7.0V
DC Input Voltage ......................................................................... –0.5V to +7.0V
DC Output Current ................................................................................... 120 mA
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.
Power Dissipation ......................................................................................... 0.5W
DC Electrical Characteristics (Over the Operating Range, TA = –40°C to +85°C, VCC = 5.0V ± 5%)
Parameters Description Test Conditions
(1)
Min. Typ
VOH Output HIGH Voltage VCC = Min., VIN = VIH or VIL IOH = –15.0 mA 2.4 3.0 V
VOL Output LOW Current VCC = Min., VIN = VIH or VIL IOL = 64 mA 0.3 0.55 V
(2)
Max. Units
VOL Output LOW Current VCC = Min., VIN = VIH or VIL IOL = 12 mA (25Ω Series) 0.3 0.50 V
VIH Input HIGH Voltage Guaranteed Logic HIGH Level 2.0 V
VIL Input LOW Voltage Guaranteed Logic LOW Level 0.8 V
IIH Input HIGH Current VCC = Max. VIN = VCC 1µA
IIL Input LOW Current VCC = Max. VIN = GND – 1 µA
IOZH High Impedance VCC = MAX.VOUT = 2.7V 1 µA
IOZL Output Current VOUT = 0.5V –1 µA
VIK Clamp Diode Voltage VCC = Min., IIN = –18 mA –0.7 –1.2 V
IOFF Power Down Disable VCC = GND, V OUT = 4.5V — — 10 0 µA
IOS Short Circuit Current VCC = Max.
(3)
, VOUT = GND –60 –120 mA
VH Input Hysteresis 200 mV
Capacitance (TA = 25°C, f = 1 MHz)
Parameters
CIN Input Capacitance VIN = 0V 6 10 pF
COUT Output Capacitance VOUT = 0V 8 12 pF
(4)
Description Test Conditions Typ Max. Units
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.
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PS2015B 10/06/04
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