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PI74LPT241
3.3V 8-BIT BUFFER/LINE DRIVER
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PS2057A 01/14/97
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OE
A
DA
0
OB
0
OB
1
DA
1
OB
2
DA
2
OB
3
DA
3
OA
0
DB
0
OE
B
OA
1
DB
1
OA
2
DB
2
OA
3
DB
3
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PI74LPT241
Fast CMOS 3.3V 8-Bit
Buffer/Line Driver
Logic Block Diagram
Product Pin Configuration
Product Pin Description
Pin Name Description
OEA, OEB 3-State Output Enable
Inputs
Dxx Inputs
Oxx Outputs
GND Ground
VCC Power
OEA
DA0
OB0
DA1
OB1
DA2
OB2
DA3
OB3
GND
V
CC
OEB
OA0
DB0
OA1
DB1
OA2
DB2
OA3
DB3
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
20-PIN
L20
Q20
R20
S20
Inputs Outputs
OEA OEB DXX OXX
LHLL
LHHH
HLXZ
Truth Table
(1)
Note:
1. H = High Voltage Level, X = Don't Care,
L = Low Voltage Level, Z = High Impedance
Product Description
Pericom Semiconductor’s PI74LPT series of logic circuits are produced in the Company’s advanced 0.6 micron CMOS technology,
achieving industry leading speed grades.
The PI74LPT241 is an 8-bit buffer/line driver designed for driving
high capacitive memory loads. With its balanced-drive
characteristics, this high-speed, low power device provides lower
ground bounce, transmission line matching of signals, fewer line
reflections and lower EMI and RFI effects. This makes it ideal for
driving on-board buses and transmission lines.
The PI74LPT241 can be driven from either 3.3V or 5.0V devices
allowing this device to be used as a translator in a mixed
3.3/5.0V system.
Product Features
• Compatible with LCX™ and LVT™ families of products
• Supports 5V tolerant mixed signal mode operation
– Input can be 3V or 5V
– Output can be 3V or connected to 5V bus
• Advanced low power CMOS operation
• Excellent output drive capability:
Balanced drives (24 mA sink and source)
• Low ground bounce outputs
• 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 150-mil wide plastic QSOP (Q)
– 20-pin 150-mil wide plastic TQSOP (R)
– 20-pin 300-mil wide plastic SOIC (S)
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
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PI74LPT241
3.3V 8-BIT BUFFER/LINE DRIVER
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Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
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, VCC = 2.7V to 3.6V)
Parameters Description Test Conditions
(1)
Min. Typ
(2)
Max. Units
VIH Input HIGH Voltage (Input pins) Guaranteed Logic HIGH Level 2.2 — 5.5 V
Input HIGH Voltage (I/O pins) 2.0 — 5.5 V
VIL Input LOW Voltage Guaranteed Logic LOW Level –0.5 — 0.8 V
(Input and I/O pins)
IIH Input HIGH Current (Input pins) VCC = Max. VIN = 5.5V — — ±1 µA
Input HIGH Current (I/O pins) VCC = Max. VIN = VCC ——±1µA
IIL Input LOW Current (Input pins) VCC = Max. VIN = GND — — ±1 µA
Input LOW Current (I/O pins) VCC = Max. VIN = GND — — ±1 µA
IOZH High Impedance Output Current VCC = Max. VOUT = 5.5V — — ±1 µA
IOZL (3-State Output pins) VCC = Max. VOUT = GND — — ±1 µA
VIK Clamp Diode Voltage VCC = Min., IIN = –18 mA — –0.7 –1.2 V
IODH Output HIGH Current VCC = 3.3V, VIN = VIH or VIL, VO = 1.5V
(3)
–36 –60 –110 mA
IODL Output LOW Current VCC = 3.3V, VIN = VIH or VIL, VO = 1.5V
(3)
50 90 200 mA
VOH Output HIGH Voltage VCC = Min. IOH = –0.1 mA Vcc-0.2 — — V
VIN = VIH or VIL IOH = –3 mA 2.4 3.0 — V
VCC = 3.0V, IOH = –8 mA 2.4
(5)
3.0 — V
VIN = VIH or VIL IOH = –24 mA 2.0 — —
VOL Output LOW Voltage VCC = Min. IOL = 0.1 mA — — 0.2 V
VIN = VIH or VIL IOL = 16 mA — 0.2 0.4 V
IOL = 24 mA — 0.3 0.5 V
IOS Short Circuit Current
(4)
VCC = Max.
(3)
, VOUT = GND –60 –85 –240 mA
IOFF Power Down Disable VCC = 0V, VIN or VOUT
≤≤
≤≤
≤ 4.5V — — ±100 µA
VH Input Hysteresis — 150 — mV
Capacitance (TA = 25°C, f = 1 MHz)
Parameters
(1)
Description Test Conditions Typ. Max. Units
CIN Input Capacitance VIN = 0V 4.5 6 pF
COUT Output Capacitance VOUT = 0V 5.5 8 pF
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 = 3.3V, +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 guaranteed but not tested.
5. VOH = VCC – 0.6V at rated current.
Note:
1. This parameter is determined by device characterization but is not production tested.
Storage Temperature............................................................. –55°C to +125°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
Power Dissipation.................................................................................... 1.0W
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3.3V 8-BIT BUFFER/LINE DRIVER
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Power Supply Characteristics
Parameters Description Test Conditions
(1)
Min. Typ
(2)
Max. Units
ICC Quiescent Power Supply Current VCC = Max. VIN = GND or VCC 0.1 10 µA
∆ICC Quiescent Power Supply Current VCC = Max. VIN = VCC – 0.6V
(3)
2.0 30 µA
TTL Inputs HIGH
ICCD Dynamic Power Supply
(4)
VCC = Max., VIN = VCC 50 75 µA/
Outputs Open VIN = GND MHz
OEX = GND
One Bit Toggling
50% Duty Cycle
IC Total Power Supply VCC = Max., VIN = VCC – 0.6V 0.6 2.3 mA
Current
(6)
Outputs Open VIN = GND
fI = 10 MHZ
50% Duty Cycle
OEX = GND
One Bit Toggling
VCC = Max., VIN = VCC – 0.6V 2.1 4.7
(5)
Outputs Open VIN = GND
fI = 2.5 MHZ
50% Duty Cycle
OEX = GND
8 Bits Toggling
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device.
2. Typical values are at Vcc = 3.3V, +25°C ambient.
3. Per TTL driven input; all other inputs at Vcc or GND.
4. This parameter is not directly testable, but is derived for use in Total Power Supply Calculations.
5. Values for these conditions are examples of the Icc formula. These limits are guaranteed but not tested.
6. IC =IQUIESCENT + IINPUTS + IDYNAMIC
IC = ICC + ∆ICC DHNT + ICCD (fCP/2 + fINI)
ICC = Quiescent Current (ICCL, ICCH and ICCZ)
∆ICC = Power Supply Current for a TTL High Input
DH = Duty Cycle for TTL Inputs High
NT = Number of TTL Inputs at DH
ICCD = Dynamic Current Caused by an Input Transition Pair (HLH or LHL)
fCP = Clock Frequency for Register Devices (Zero for Non-Register Devices)
NCP = Number of Clock Inputs at fCP
fI = Input Frequency
NI = Number of Inputs at fI
All currents are in milliamps and all frequencies are in megahertz.
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PI74LPT241
3.3V 8-BIT BUFFER/LINE DRIVER
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Notes:
1. Propagation Delays and Enable/Disable times are with Vcc = 3.3V ±0.3V, normal range. For Vcc = 2.7V, extended range, all
Propagation Delays and Enable/Disable times should be degraded by 20%.
2. See test circuit and waveforms.
3. Minimum limits are guaranteed but not tested on Propagation Delays.
4. This parameter is guaranteed but not production tested.
5. Skew between any two outputs, of the same package, switching in the same direction. This parameter is guaranteed by design.
Switching Characteristics over Operating Range
(1)
LPT241 LPT241A LPT241C
Com. Com. Com.
Parameters Description Conditions
(2)
Min.
(3)
Max. Min.
(3)
Max. Min.
(3)
Max. Units
tPLH Propagation Delay CL = 50 pF 1.5 6.5 1.5 4.8 1.5 4.1 ns
tPHL DXX to OXX RL = 500Ω
tPZH Output Enable Time 1.5 8.0 1.5 6.2 1.5 5.8 ns
tPZL OEA/OEB to Oxx
tPHZ Output Disable Time
(4)
1.5 7.0 1.5 5.6 1.5 5.2 ns
tPLZ OEA/OEB to Oxx
tSK(o) Output Skew
(5)
0.5 0.5 0.5 ns
Pericom Semiconductor Corporation
2380 Bering Drive • San Jose, CA 95131 • 1-800-435-2336 • Fax (408) 435-1100 • http://www.pericom.com
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