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21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74LPT16646 3.3V 16-BIT REGISTERED TRANSCEIVERS
PI74LPT16646
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
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 PI74LPT16646 is a 16-bit registered transceiver organized as two independent 8-bit bus transceivers designed with 3-state D-type flip-flops and control circuitry arranged for multiplexed transmission of data directly from the data bus or from the internal storage registers. Each 8-bit transceiver utilizes the enable control (xOE) and direction pins (xDIR) to control the transceiver functions. The Select (xSAB and xSBA) control pins are used to select either real-time or stored data transfer. The circuitry used for select control will eliminate the typical decoding glitch that occurs in a multiplexer during the transition between real-time and stored data. A low input level selects real-time data and a high selects stored data. The PI74LPT16646 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.
Logic Block Diagram
1OE 2OE
8 9 10 11
B REG D C
2DIR
1DIR
1CLKBA 1SBA
2CLKBA 2SBA
1CLKAB 1SAB
2CLKAB 2SAB
B REG D C
12
2B0
1A0
2A0
A REG D C
1B0
A REG D C
13 14
TO 7 OTHER CHANNELS
TO 7 OTHER CHANNELS
15
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PI74LPT16646 3.3V 16-BIT REGISTERED TRANSCEIVERS
Product Pin Description
Pin Name xOE, xDIR xCLKAB, xCLKBA xSAB, xSBA xAx xBx GND VCC Description Output Enable Inputs (Active LOW) Clock Pulse Inputs Output Data Source Select Inputs Data Register A Inputs Data Register B Outputs Data Register B Inputs Data Register A Outputs Ground Power
Product Pin Configuration
1DIR 1CLKAB 1SAB
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
56 55 54 53 52 51 50 49 48 47 46 56-PIN 45 V56 44
1OE 1CLKBA 1SBA
GND
1A1 1A2
GND
1B1 1B2
Vcc
1A3 1A4 1A5 GND 1A6 1A7 1A8 2A1 2A2 2A3 GND 2A4 2A5 2A6
VCC
1B3 1B4 1B5 GND 1B6 1B7 1B8 2B1 2B2 2B3 GND 2B4 2B5 2B6
A56
43 42 41 40 39 38 37 36 35 34 33 32 31 30 29
VCC
2A7 2A8
VCC
2B7 2B8
GND
2SAB 2CLKAB 2DIR
GND
2SBA 2CLKBA 2OE
Truth Table(2)
Function Isolation Store A and B Data Real Time B Data to A Bus Stored B Data to A Bus Real Time A Data to B Bus Stored A Data to B Bus xOE H H L L L L xDIR X X L L H H Inputs xCLKAB xCLKBA H or L H or L X X X H or L X X H or L X xSAB X X X X L H xSBA X X L H X X Data I/O(1) xAx xBx Input Input Output Input Input Output
Note: 1. The data output functions may be enabled or disabled by various signals at the xOE or xDIR inputs. Data input functions are always enabled, i.e., data at the bus pins will be stored on every LOW-to-HIGH transition on the clock inputs. 2. H = High Voltage Level, X = Don't Care, L = Low Voltage Level, = LOW-to-HIGH Transition
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PS2073A 01/16/97
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PI74LPT16646 3.3V 16-BIT REGISTERED TRANSCEIVERS
REAL-TIME TRANSFER BUS B TO A
REAL-TIME TRANSFER BUS A TO B
1 2 3 4 5
BUS A
BUS B
BUS A
BUS B
xDIR L
xOE xCLKAB xCLKBA L X X
xSAB X
xSBA L
xDIR H
xOE xCLKAB xCLKBA L X X
xSAB L
xSBA X
STORAGE FROM A AND/OR B
TRANSFER STORES DATA TO A AND/OR B
6 7 8 9
BUS A
BUS B
BUS A
BUS B
xDIR H L X
xOE xCLKAB xCLKBA L X L X H
xSAB X X X
xSBA X X X
xDIR(1) xOE xCLKAB xCLKBA L L X H or L H L H or L X
xSAB X H
xSBA H X
10 11
Note: 1. Cannot transfer data to A bus and B bus simultaneously.
12 13 14 15
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PI74LPT16646 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) -- -- -- -- -- -- -- -- -- -0.7 -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 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 -- VCC = Max.(3), 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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PI74LPT16646 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
1 2 3 4 5
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)
6 7 8 9 10 11 12 13 14 15
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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PS2073A 01/16/97
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PI74LPT16646 3.3V 16-BIT REGISTERED TRANSCEIVERS
Switching Characteristics over Operating Range(1)
LPT16646 Com.
(2)
LPT16646A Com.
LPT16646C Com.
Parameters tPLH tPHL tPZH tPZL tPHZ tPLZ tPLH tPHL tPLH tPHL tSU tH tW tSK(o)
Description Propagation Delay Bus to Bus Output Enable Time XDIR or XOE to Bus Output Disable Time(4) XDIR or XOE to Bus Propagation Delay Clock to Bus Propagation Delay xSBA or xSAB to Bus Setup Time HIGH or LOW, BUS to Clock Hold Time HIGH or LOW, Bus to Clock Clock Pulse Width(4) HIGH or LOW Output Skew(5)
Conditions CL = 50 pF RL = 500
Min
(3)
Max
Min
(3)
Max
Min
(3)
Max
Unit
2.0 2.0 2.0 2.0 2.0 4.0 2.0 6.0 --
9.0 14.0 9.0 9.0 11.0 -- -- -- 0.5
2.0 2.0 2.0 2.0 2.0 2.0 1.5 5.0 --
6.3 9.8 6.3 6.3 7.7 -- -- -- 0.5
1.5 1.5 1.5 1.5 1.5 2.0 1.5 5.0 --
5.4 7.8 6.3 5.7 6.2 -- -- -- 0.5
ns ns ns ns ns ns ns ns ns
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
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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PS2073A 01/16/97

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