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PI74LPT16827
3.3V 20-BIT BUFFERS
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PI74LPT16827
Fast CMOS 3.3V 20-Bit Buffers
Logic Block Diagram
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)
• Pin compatible with industry standard double-density
pinouts
• Low ground bounce outputs
• Hysteresis on all inputs
• Industrial operating temperature range: –40°C to +85°C
• Multiple center pins and distributed Vcc/GND pins
minimize switching noise
• Packages available:
– 56-pin 240 mil wide plastic TSSOP (A)
– 56-pin 300 mil wide plastic SSOP (V)
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 PI74LPT16827 is a 20-bit wide bus driver designed to provide
buffering and high-performance bus interfacing for wide data/
address paths or busses with parity. Two pairs of nanded output
enable controls allow the device to be operated as two 10-bit buffers
or as one 20-bit buffer. Signal pins are arranged in a flow-through
organization for ease of layout and hysteresis is designed into all
inputs to improve noise margin.
The PI74LPT16827 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.
1OE1
1OE2
1
A
1
1
Y
1
To 9 other channels
2OE1
2OE2
2
A
1
2
Y
1
To 9 other channels
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Product Pin Configuration
Note:
1. This parameter is determined by device characterization but is not production tested.
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
Pin Name Description
xOEx Output Enable Inputs (Active LOW)
xAx Data Inputs
xYx 3-State Outputs
Product Pin Description
Inputs Outputs
xOE1 xOE2 xAx xYx
LLL L
LLH H
HXX Z
XHX Z
Truth Table(1)
1. H = High Voltage Level
L = Low Voltage Level
X = Don't Care
Z = High Impedance
1OE1
1
1Y1
2
1Y2
3
GND 4
1Y3
5
1Y4
6
V
CC
7
1Y5
8
1Y6
9
1Y7
10
GND 11
1Y8
12
1Y9
13
1Y10
14
2Y1
15
2Y2
16
2Y3
17
GND 18
2Y4
19
2Y5
20
2Y6
21
V
CC
22
2Y7
23
2Y8
24
1OE2
56
1A1
55
1A2
54
GND53
1A3
52
1A4
51
V
CC
50
1A5
49
1A6
48
1A7
47
GND46
1A8
45
1A9
44
1A10
43
2A1
42
2A2
41
2A3
40
GND39
2A4
38
2A5
37
2A6
36
V
CC
35
2A7
34
2A8
33
GND 25
2Y9
26
2Y10
27
2OE1
28
GND32
2A9
31
2A10
30
2OE2
29
56-Pin
V-56
A56
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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
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.
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.
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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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
XOE = 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
XOE = 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
XOE = GND
16 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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LPT16827A LPT16827B LPT16827C
Com. Com. Com.
Parameters Description Conditions
(2)
Min.
(3)
Max. Min.
(3)
Max. Min.
(3)
Max. Units
t
PLH
Propagation Delay CL = 50 pF 1.5 6.5 1.5 5.0 1.5 4.4 ns
t
PHL
DN to Y
N
RL = 500
Ω
CL = 300 pF
(4)
1.5 15.0 1.5 13.0 1.5 10.0 ns
R
L
= 500
Ω
t
PZH
Output Enable Time CL = 50 pF 1.5 9.5 1.5 8.0 1.5 7.0 ns
t
PZL
OEN to Y
N
RL = 500
Ω
CL = 300 pF
(4)
1.5 23.0 1.5 15.0 1.5 14.0 ns
R
L
= 500
Ω
t
PHZ
Output Disable Time
(4)
CL = 50 pF
(4)
1.5 8.5 1.5 6.0 1.5 5.7 ns
t
PLZ
OEN to Y
N
RL = 500
Ω
CL = 50 pF 1.5 10.0 1.5 7.0 1.5 6.0 ns
RL = 500
Ω
tSK(o) Output Skew
(5)
— 0.5 — 0.5 — 0.5 ns
Switching Characteristics over Operating Range
(1)
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.
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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