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Logic Block Diagram
1OEBA 2OEBA
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PI74LPT16952 3.3V 16-BIT REGISTERED TRANSCEIVERS
PI74LPT16952
Fast CMOS 3.3V 16-Bit Registered Transceivers
Product Features
* Compatible with LCXTM and LVTTM 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: -40C to +85C * 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)
1 2 3 4 5 6 7 8 9 10
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 PI74LPT16952 is a 16-bit registered transceivers organized with two sets of eight D-type latches with separate input and output controls for each set. For data flow from A to B, for example, the Ato-B Enable (xCEAB) input must be LOW to enter data from xAx. The data present on the A port will be clocked on the B register when xCLKAB toggles from LOW-to-HIGH. The xOEAB control performs the output enable function on the B port. Control of data from B to A is similar, but uses the xCEAB, xCLKAB, and xOEAB inputs. By connecting the control pins of the two independent transceivers together, a full 16-bit operation can be achieved. The output buffers are designed with a Power-Off disable allowing "live insertion" of boards when used as backplane drivers. The PI74LPT16952 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.
1CEBA
2CEBA
1CLKBA 1OEAB
2CLKBA 2OEAB
11 12
1CEAB
2CEAB
1CLKAB
2CLKAB
C
1A0 2A0
C
1B0
13
2B0
D C D
D C D
14 15
TO 7 OTHER CHANNELS
TO 7 OTHER CHANNELS
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Product Pin Description
Pin Name xOEAB xOEBA xCEAB xCEBA xCLKAB xCLKBA xAx xBx GND VCC Description A-to-B Output Enable Input (Active LOW) B-to-A Output Enable Input (Active LOW) A-to-B Clock Enable Input (Active LOW) B-to-A Clock Enable Input (Active LOW) A-to-B Clock Input B-to-A Clock Input A-to-B Data Inputs or B-to-A 3-State Outputs B-to-A Data Inputs or B-to-A 3-State Outputs Ground Power
Product Pin Configuration
1OEAB 1CLKAB 1CEAB
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PI74LPT16952 3.3V 16-BIT REGISTERED TRANSCEIVERS
Truth Table(1,2)
Inputs
XCEAB XCLKAB XOEAB XAX
Outputs
XBX
H X L L X
X L X
L L L L H
X X L H X
B(3) B(3) L H High Z
Notes: 1. H = High Voltage Level L = Low Voltage Level X = Don't Care or Irrelevant = LOW-to-HIGH Transition Z = High Impedance 2. A-to-B data flow shown. B-to-A flow control is the same, except using xCEBA, xCLKBA, and xOEBA. 3. Level of B before the indicated steady-state input conditions were established.
GND
1A0 1A1
1 2 3 4 5 6 7 8 9 10 11 12
56 55 54 53 52 51 50 49 48 47 46
1OEBA 1CLKBA 1CEBA
GND
1B0 1B1
VCC
1A2 1A3 1A4 GND 1A5 1A6 1A7 2A0 2A1 2A2 GND 2A3 2A4 2A5
VCC
1B2 1B3 1B4 GND 1B5 1B6 1B7 2B0 2B1 2B2 GND 2B3 2B4 2B5
45 13 44 14 56-PIN 43 15 V56 42 16 A56 41 17 40 18 19 20 21 22 23 24 25 26 27 28 39 38 37 36 35 34 33 32 31 30 29
VCC
2A6 2A7
VCC
2B6 2B7
GND
2CEAB 2CLKAB 2OEAB
GND
2CEBA 2CLKBA 2OEBA
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PS2076A 02/4/97
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PI74LPT16952 3.3V 16-BIT REGISTERED TRANSCEIVERS
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.) Storage Temperature ............................................................. -55C to +125C Ambient Temperature with Power Applied ............................ -40C to +85C 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 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 = -40C to +85C, VCC = 2.7V to 3.6V)
Parameters VIH VIL IIH IIL IOZH IOZL VIK IODH IODL VOH Description Input HIGH Voltage (Input pins) Input HIGH Voltage (I/O pins) Input LOW Voltage (Input and I/O pins) Input HIGH Current (Input pins) Input HIGH Current (I/O pins) Input LOW Current (Input pins) Input LOW Current (I/O pins) High Impedance Output Current (3-State Output pins) Clamp Diode Voltage Output HIGH Current Output LOW Current Output HIGH Voltage Test Conditions(1) Guaranteed Logic HIGH Level Guaranteed Logic LOW Level Min. 2.2 2.0 -0.5 Typ(2) -- -- -- -- -- -- -- -- -- -70 -60 90 -- 3.0 3.0 -- -- 0.2 0.3 -85 -- 150 Max. 5.5 5.5 0.8 1 1 1 1 1 1 -1.2 -110 200 -- -- -- -- 0.2 0.4 0.5 -240 100 -- Units V V V A A A A A A V mA mA V V V V V V V mA A mV
VOL
Output LOW Voltage
IOS IOFF VH
Short Circuit Current(4) Power Down Disable Input Hysteresis
VCC = Max. VIN = 5.5V -- VCC = Max. VIN = VCC -- VCC = Max. VIN = GND -- VCC = Max. VIN = GND -- VCC = Max. VOUT = 5.5V -- VCC = Max. VOUT = GND -- VCC = Min., IIN = -18 mA -- VCC = 3.3V, VIN = VIH or VIL, VO = 1.5V(3) -36 (3) VCC = 3.3V, VIN = VIH or VIL, VO = 1.5V 50 VCC = Min. IOH = -0.1 mA Vcc-0.2 VIN = VIH or VIL IOH = -3 mA 2.4 VCC = 3.0V IOH = -8 mA 2.4(5) VIN = VIH or VIL IOH = -24 mA 2.0 VCC = Min. IOL =0.1 mA -- VIN = VIH or VIL IOL = 16 mA -- IOL = 24 mA -- (3) VCC = Max. , VOUT = GND -60 VCC = 0V, VIN or VOUT 4.5V -- --
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, +25C 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.
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PI74LPT16952 3.3V 16-BIT REGISTERED TRANSCEIVERS
Power Supply Characteristics
Parameters Description ICC ICC ICCD Quiescent Power Supply Current Quiescent Power Supply Current TTL Inputs HIGH Dynamic Power Supply(4) Test Conditions(1) VCC = Max. VCC = Max. VCC = Max., Outputs Open XOE = GND One Bit Toggling 50% Duty Cycle VCC = Max., Outputs Open fI = 10 MHZ 50% Duty Cycle XOE = GND One Bit Toggling VCC = Max., Outputs Open fI = 2.5 MHZ 50% Duty Cycle XOE = GND 16 Bits Toggling VIN = GND or VCC VIN = VCC - 0.6V(3) VIN = VCC VIN = GND Min. Typ(2) 0.1 2.0 50 Max. 10 30 75 Units A A A/ MHz
IC
Total Power Supply Current(6)
VIN = VCC - 0.6V VIN = GND
0.6
2.3
mA
VIN = VCC - 0.6V VIN = GND
2.1
4.7(5)
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, +25C 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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PS2076A 02/4/97
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PI74LPT16952 3.3V 16-BIT REGISTERED TRANSCEIVERS
Switching Characteristics over Operating Range(1)
LPT16952A Com.
Parameters tPLH tPHL tPZH tPZL tPHZ tPLZ tSU tH tSU Description Propagation Delay to XBX, XAX Output Enable Time XOEBA, XOEAB to XAX, XBX Output Disable Time(4) XOEBA, XOEAB to XAX, XBX Set-up Time HIGH or LOW xAx, xBx to xCLKAB, xCLKBA Hold Time HIGH or LOW xAx, xBx to xCLKAB, xCLKBA Setup Time HIGH or LOW xCEAB, xCEBA to xCLKAB, xCLKBA Hold Time HIGH or LOW xCEAB, xCEBA to xCLKAB, xCLKBA Pulse Width HIGH(4) or LOW, xCLKAB or xCLKBA Output Skew(5)
XCLKAB, XCLKBA
LPT16952B Com.
Min.(3) 2.0 1.5 1.5 2.5 2.0 3.0 Max. 7.5 8.0 7.5 -- -- --
LPT16952C Com.
Min.(3) 2.0 1.5 1.5 2.5 2.0 3.0 Max. 6.3 7.0 6.5 -- -- -- Units ns ns ns ns ns ns
1 2 3 4 5
Conditions(2) CL = 50 pF RL = 500
Min.(3) 2.0 1.5 1.5 2.5 2.0 3.0
Max. 10.0 10.5 10.0 -- -- --
tH
2.0
--
2.0
--
2.0
--
ns
tW tSK(o)
3.0 --
-- 0.5
3.0 --
-- 0.5
3.0 --
-- 0.5
ns ns
6 7 8 9 10
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 wave forms. 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.
Capacitance (TA = 25C, f = 1 MHz)
Parameters(1) CIN COUT Description Input Capacitance Output Capacitance Test Conditions VIN = 0V VOUT = 0V Typ. 4.5 5.5 Max. 6 8 Units pF pF
11 12 13 14 15
Note: 1. This parameter is determined by device characterization but is not production tested.
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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PS2076A 02/4/97

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