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DM74LS169A Synchronous 4-Bit Up/Down Binary Counter
April 1998
DM74LS169A Synchronous 4-Bit Up/Down Binary Counter
General Description
This synchronous presettable counter features an internal carry look-ahead for cascading in high-speed counting applications. Synchronous operation is provided by having all flip-flops clocked simultaneously, so that the outputs all change at the same time when so instructed by the count-enable inputs and internal gating. This mode of operation helps eliminate the output counting spikes that are normally associated with asynchronous (ripple clock) counters. A buffered clock input triggers the four master-slave flip-flops on the rising edge of the clock waveform. This counter is fully programmable; that is, the outputs may each be preset either high or low. The load input circuitry allows loading with the carry-enable output of cascaded counters. As loading is synchronous, setting up a low level at the load input disables the counter and causes the outputs to agree with the data inputs after the next clock pulse. The carry look-ahead circuitry permits cascading counters for n-bit synchronous applications without additional gating. Both count-enable inputs (P and T) must be low to count. The direction of the count is determined by the level of the up/down input. When the input is high, the counter counts up; when low, it counts down. Input T is fed forward to enable the carry outputs. The carry output thus enabled will produce a low-level output pulse with a duration approximately equal to the high portion of the QA output when counting up, and approximately equal to the low portion of the QA output when counting down. This low-level overflow carry pulse can be used to enable successively cascaded stages. Transitions at the enable P or T inputs are allowed regardless of the level of the clock input. All inputs are diode clamped to minimize transmission-line effects, thereby simplifying system design. This counter features a fully independent clock circuit. Changes at control inputs (enable P, enable T, load, up/ down), which modify the operating mode, have no effect until clocking occurs. The function of the counter (whether enabled, disabled, loading, or counting) will be dictated solely by the conditions meeting the stable setup and hold times.
Features
n Fully synchronous operation for counting and programming. n Internal look-ahead for fast counting. n Carry output for n-bit cascading. n Fully independent clock circuit
Connection Diagram
Dual-In-Line Package
DS006401-1
Order Number 54LS169DMQB, 54LS169FMQB, 54LS169LMQB, DM54LS169AJ, DM54LS169AW, DM74LS169AM or DM74LS169AN See Package Number E20A, J16A, M16A, N16E or W16A
(c) 1998 Fairchild Semiconductor Corporation
DS006401
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Absolute Maximum Ratings (Note 1)
Supply Voltage Input Voltage Operating Free Air Temperature Range 7V 7V
DM54LS and 54LS DM74LS Storage Temperature Range
-55C to +125C 0C to +70C -65C to +150C
Recommended Operating Conditions
Symbol VCC VIH VIL IOH IOL fCLK tW tSU Supply Voltage High Level Input Voltage Low Level Input Voltage High Level Output Current Low Level Output Current Clock Frequency (Note 2) Clock Frequency (Note 3) Clock Pulse Width (Note 4) Setup Time (Note 4) Data Enable T or P Load U/D tH TA Hold Time (Note 4) Free Air Operating Temperature 25 30 0 -55 125 25 30 0 0 70 ns C 0 0 25 20 20 Parameter Min 4.5 2 0.7 -0.4 4 25 20 0 0 25 20 20 ns DM54LS169A Nom 5 Max 5.5 Min 4.75 2 0.8 -0.4 8 25 20 DM74LS169A Nom 5 Max 5.25 V V V mA mA MHz MHz ns Units
Note 1: The "Absolute Maximum Ratings" are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. The parametric values defined in the "Electrical Characteristics" table are not guaranteed at the absolute maximum ratings. The "Recommended Operating Conditions" table will define the conditions for actual device operation. Note 2: CL = 15 pF, RL = 2 k, TA = 25C and VCC = 5V. Note 3: CL = 50 pF, RL = 2 k, TA = 25C and VCC = 5V. Note 4: TA = 25C and VCC = 5V.
Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted) Symbol VI VOH VOL Parameter Input Clamp Voltage High Level Output Voltage Low Level Output Voltage II IIH IIL IOS ICC Input Current @ Max Input Voltage High Level Input Current Low Level Input Current Short Circuit Output Current Supply Current Conditions VCC = Min, II = -18 mA VCC = Min, IOH = Max VIL = Max, VIH = Min VCC = Min, IOL = Max VIL = Max, VIH = Min IOL = 4 mA, VCC = Min VCC = Max VI = 7V VCC = Max VI = 2.7V VCC = Max VI = 0.4V VCC = Max (Note 6) VCC = Max(Note 7) Min Typ (Note 5) -1.5 DM54 DM74 DM54 DM74 DM74 Enable T Others Enable T Others Enable T Others DM54 DM74 -20 -20 20 2.5 2.7 3.4 3.4 0.25 0.35 0.25 0.4 0.5 0.4 0.2 0.1 40 20 -0.8 -0.4 -100 -100 34 mA mA mA A mA V V V Max Units
Note 5: All typicals are at VCC = 5V and TA = 25C. Note 6: Not more than one output should be shorted at a time, and the duration should not exceed one second. Note 7: ICC is measured after a momentary 4.5V, then ground, is applied to the CLOCK with all other inputs grounded and all the outputs open.
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Switching Characteristic
at VCC = 5V and TA = 25C (for Test Waveforms and Output Load) From (Input) Symbol fMAX tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL Parameter Maximum Clock Frequency Propagation Delay Time Low to High Level Output Propagation Delay Time High to Low Level Output Propagation Delay Time Low to High Level Output Propagation Delay Time High to Low Level Output Propagation Delay Time Low to High Level Output Propagation Delay Time High to Low Level Output Propagation Delay Time Low to High Level Output Propagation Delay Time High to Low Level Output Clock to Ripple Carry Clock to Ripple Carry Clock to Any Q Clock to Any Q Enable T to Ripple Carry Enable T to Ripple Carry Up/Down to Ripple Carry (Note 8) Up/Down to Ripple Carry (Note 8) 29 38 ns 25 30 ns 18 28 ns 18 24 ns 23 32 ns 20 24 ns 35 44 ns 35 39 ns To (Output) CL = 15 pF Min 25 Max RL = 2 k CL = 50 pF Min 20 Max MHz Units
Note 8: The propagation delay from UP/DOWN to RIPPLE CARRY must be measured with the counter at either a minimum or a maximum count. As the logic level of the up/down input is changed, the ripple carry output will follow. If the count is minimum, the ripple carry output transition will be in phase. If the count is maximum, the ripple carry output will be out of phase.
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Logic Diagram
LS169A Binary Counter
DS006401-2
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Timing Diagram
LS169A Binary Counters Typical Load, Count, and Inhibit Sequences
DS006401-3
5
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Physical Dimensions
inches (millimeters) unless otherwise noted
Ceramic Leadless Chip Carrier Package (E) Order Number 54LS169LMQB Package Number E20A
16-Lead Ceramic Dual-In-Line Package (J) Order Number 54LS169DMQB or DM54LS169AJ Package Number J16A
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Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
16-Lead Small Outline Molded Package (M) Order Number DM74LS169AM Package Number M16A
16-Lead Molded Dual-In-Line Package (N) Order Number DM74LS169AN Package Number N16E
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DM74LS169A Synchronous 4-Bit Up/Down Binary Counter
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
16-Lead Ceramic Flat Package (W) Order Number 54LS169FMQB or DM54LS169AW Package Number W16A
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: 2. A critical component in any component of a life support 1. Life support devices or systems are devices or sysdevice or system whose failure to perform can be reatems which, (a) are intended for surgical implant into sonably expected to cause the failure of the life support the body, or (b) support or sustain life, and (c) whose device or system, or to affect its safety or effectiveness. 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.
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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.

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