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74ACT16646 16-Bit Transceiver/Register with 3-STATE Outputs
August 1999 Revised October 1999
74ACT16646 16-Bit Transceiver/Register with 3-STATE Outputs
General Description
The ACT16646 contains sixteen non-inverting bidirectional registered bus transceivers providing multiplexed transmission of data directly from the input bus or from the internal storage registers. Each byte has separate control inputs which can be shorted together for full 16-bit operation. The DIR inputs determine the direction of data flow through the device. The CPAB and CPBA inputs load data into the registers on the LOW-to-HIGH transition.
Features
s Independent registers for A and B buses s Multiplexed real-time and stored data transfers s Separate control logic for each byte s 16-bit version of the ACT646 s Outputs source/sink 24 mA s TTL-compatible inputs
Ordering Code:
Order Number 74ACT16646SSC 74ACT16646MTD Package Number MS56A MTD56 Package Description 56-Lead Shrink Small Outline Package (SSOP), JEDEC MO-118, 0.300" Wide 56-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide
Device also available in Tape and Reel. Specify by appending suffix letter "X" to the ordering code.
Logic Symbol
Connection Diagram
FACTTM is a trademark of Fairchild Semiconductor Corporation.
(c) 1999 Fairchild Semiconductor Corporation
DS500345
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74ACT16646
Function Table
Inputs G1 H H H L L L L L L L L DIR1 X X X H H H H L L L L CPAB1 CPBA1 SAB1 H or L X SBA1 X X X X X X X L L H H Output Input Input Input Input Data I/O (Note 1) A0-7 B0-7 Isolation Clock An Data into A Register Clock Bn Data Into B Register An to Bn--Real Time (Transparent Mode) Output Clock An Data to A Register A Register to Bn (Stored Mode) Clock An Data into A Register and Output to Bn Bn to An--Real Time (Transparent Mode) Clock Bn Data into B Register B Register to An (Stored Mode) Clock Bn into B Register and Output to An
= LOW-to-HIGH Transition.
Output Operation Mode

X X X X X
H or L
X X X L L H H X X X X
X X X X X
H or L
H or L

X
H = HIGH Voltage Level
X = Immaterial
L = LOW Voltage Level
Note 1: The data output functions may be enabled or disabled by various signals at the G and DIR inputs. Data input functions are always enabled; i.e., data at the bus pins will be stored on every LOW-to-HIGH transition of the appropriate clock inputs. Also applies to data I/O (A and B: 8-15) and #2 control pins.
Real Time Transfer A-Bus to B-Bus
Storage from Bus to Register
Real Time Transfer B-Bus to A-Bus
Transfer from Register to Bus
Logic Diagram
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74ACT16646
Absolute Maximum Ratings(Note 2)
Supply Voltage (VCC) DC Input Diode Current (IIK) VI = -0.5V VI = VCC + 0.5V DC Output Diode Current (IOK) VO = -0.5V VO = VCC + 0.5V DC Output Voltage (VO) DC Output Source/Sink Current (IO) DC VCC or Ground Current per Output Pin Storage Temperature 50 mA -65C to +150C -20 mA +20 mA -0.5V to VCC + 0.5V 50 mA -20 mA +20 mA -0.5V to +7.0V
Recommended Operating Conditions
Supply Voltage (VCC) Input Voltage (VI) Output Voltage (VO) Operating Temperature (TA) Minimum Input Edge Rate (V/t) VIN from 0.8V to 2.0V VCC @ 4.5V, 5.5V
Note 2: Absolute maximum ratings are those values beyond which damage to the device may occur. The databook specifications should be met, without exception to ensure that the system design is reliable over its power supply, temperature, and output/input loading variables. Fairchild does not recommend operation of FACTTM circuits outside databook specifications.
4.5V to 5.5V 0V to VCC 0V to VCC -40C to +85C 125 mV/ns
DC Electrical Characteristics
Symbol VIH VIL VOH Parameter Minimum HIGH Input Voltage Maximum LOW Input Voltage Minimum HIGH Output Voltage VCC (V) 4.5 5.5 4.5 5.5 4.5 5.5 4.5 5.5 VOL Maximum LOW Output Voltage 4.5 5.5 4.5 5.5 IOZT IIN ICCT ICC IOLD IOHD Maximum I/O Leakage Current Maximum Input Leakage Current Maximum ICC/Input Max Quiescent Supply Current Minimum Dynamic Output Current (Note 4) 5.5 5.5 5.5 5.5 5.5 0.6 8.0 0.001 0.001 TA = +25C Typ 1.5 1.5 1.5 1.5 4.49 5.49 2.0 2.0 0.8 0.8 4.4 5.4 3.86 4.86 0.1 0.1 0.36 0.36 0.5 0.1 TA = -40C to+85C Guaranteed Limits 2.0 2.0 0.8 0.8 4.4 5.4 3.76 4.76 0.1 0.1 0.44 0.44 5.0 1.0 1.5 80.0 75 -75 A A mA A mA mA V Units V V V Conditions VOUT = 0.1V or VCC - 0.1V VOUT = 0.1V or VCC - 0.1V IOUT = -50 A VIN = VIL or VIH V IOH = -24 mA IOH = -24 mA (Note 3) IOUT = 50 A VIN = VIL or VIH V IOL = 24 mA IOL = 24 mA (Note 3) VIN = VIL, VIH VO = VCC, GND VI = VCC, GND VI = VCC - 2.1V VIN = VCC or GND VOLD = 1.65V Max VOHD = 3.85V Min
Note 3: All outputs loaded; thresholds associated with output under test. Note 4: Maximum test duration 2.0 ms; one output loaded at a time.
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74ACT16646
AC Electrical Characteristics
VCC Symbol tPHL tPLH tPHL tPLH tPHL tPLH tPZL tPZH tPLZ tPHZ tPZL tPZH tPLZ tPHZ Parameter Propagation Delay Clock to Bus Propagation Delay Bus to Bus Propagation Delay Select to Bus (w/An or Bn HIGH or LOW) Enable Time G to An/Bn Disable Time G to An/Bn Enable Time DIR to An/Bn Disable Time DIR to An/Bn 5.0 5.0 5.0 5.0 5.3 4.6 3.0 3.4 5.1 4.6 2.9 3.4 7.8 6.9 5.5 5.7 8.2 7.5 5.8 6.1 10.5 9.4 8.1 8.3 11.8 10.8 9.2 9.2 3.8 3.3 2.3 2.6 4.3 3.7 2.0 2.5 11.4 10.2 8.6 8.6 12.7 11.7 9.8 9.7 ns ns ns ns (V) (Note 5) 5.0 5.0 5.0 Min 4.6 4.3 4.0 4.1 4.0 4.2 TA = +25C CL = 50 pF Typ 6.9 6.5 6.2 6.4 6.4 6.7 Max 9.4 8.9 8.5 8.6 8.9 9.5 TA = -40C to +85C CL = 50 pF Min 3.6 3.3 2.9 3.2 3.1 3.2 Max 10.1 9.7 9.2 9.3 9.6 10.4 ns ns ns Units
Note 5: Voltage Range 5.0 is 5.0V 0.5V.
AC Operating Requirements
VCC Symbol Parameter (V) (Note 6) tS tH tW Setup Time, H or L Bus to Clock Hold Time, H or L Bus to Clock Clock Pulse Width H or L
Note 6: Voltage Range 5.0 is 5.0V 0.5V.
TA = +25C CL = 50 pF
TA = -40C to +85C CL = 50 pF Units
Guaranteed Minimum 3.0 1.5 4.0 3.0 1.5 4.0 ns ns ns
5.0 5.0 5.0
Capacitance
Symbol CIN CPD Parameter Input Capacitance Power Dissipation Capacitance Typ 4.5 95 Units pF pF VCC = 5.0V VCC = 5.0V Conditions
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74ACT16646
Physical Dimensions inches (millimeters) unless otherwise noted
56-Lead Shrink Small Outline Package (SSOP), JEDEC MO-118, 0.300" Wide Package Number MS56A
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74ACT16646 16-Bit Transceiver/Register with 3-STATE Outputs
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
56-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide Package Number MTD56
Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications. LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. www.fairchildsemi.com 6 2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com

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