MC74F195 4-BIT PARALLEL ACCESS SHIFT REGISTER The functional characteristics of the MC74F195 4-Bit Parallel Access Shift Register are indicated in the Logic Diagram and Function Table. The device is useful in a wide variety of shifting, counting, and storage applications. It performs serial, parallel, serial-to-parallel, or parallel-to-serial data transfers at very high speeds. The MC74F195 operates in two primary modes, shift right (Q0-Q1) and parallel load, which are controlled by the state of the Parallel Enable (PE) input. Serial data enters the first flip-flop (Q0) via the J and K inputs when the PE input is HIGH, and is shifted 1 bit in the direction Q0-Q1-Q2-Q3 following each LOW-to-HIGH clock transition. The J and K inputs provide the flexibility of the JK type input is made for special applications, and by tying the two pins together the simple D-type input is made for general applications. The device appears as four common clocked D flip-flops when the PE input is LOW. After the LOW-to-HIGH clock transition, data on the parallel inputs (D0-D3) is transferred to the respective Q0-Q3 outputs. Shift left operation (Q3-Q2) can be achieved by tying the Qn outputs to the Dn-1 inputs and holding the PE input LOW. All parallel and serial data transfers are synchronous, occurring after each LOW-to-HIGH clock transition. The MC74F195 utilizes edge-triggering; therefore, there is no restriction on the activity of the J, K, Dn, and PE inputs for logic operation, other than the setup and hold time requirements. A LOW on the asynchronous Master Reset (MR) input sets all Q outputs LOW, independent of any other input condition. • Shift Right and Parallel Load Capability • J-K (D-Type) Inputs to First Stage • Complement Output from Last Stage • Asynchronous Master Reset 4-BIT PARALLEL ACCESS SHIFT REGISTER FAST SCHOTTKY TTL J SUFFIX CERAMIC CASE 620-09 16 1 N SUFFIX PLASTIC CASE 648-08 16 1 D SUFFIX SOIC CASE 751B-03 16 1 ORDERING INFORMATION MC74FXXXJ MC74FXXXN MC74FXXXD CONNECTION DIAGRAM DIP VCC Q0 Q1 Q2 Q3 Q3 CP PE 16 15 14 13 12 11 10 9 Ceramic Plastic SOIC LOGIC SYMBOL 9 2 1 2 3 4 5 6 7 8 MR J K D0 D1 D2 D3 GND 10 3 J 4 5 6 7 PE D0 D1 D2 D3 Q3 CP K MR Q0 Q1 Q2 Q3 1 15 14 13 12 VCC = PIN 16 GND = PIN 8 FAST AND LS TTL DATA 4-104 11 MC74F195 GUARANTEED OPERATING RANGES Symbol Parameter Min Typ Max Unit VCC Supply Voltage 74 4.5 5.0 5.5 V TA Operating Ambient Temperature Range 74 0 25 70 °C IOH Output Current High 74 –1.0 mA IOL Output Current Low 74 20 mA LOGIC DIAGRAM J K D0 D1 D2 D3 PE CP MR R RD Q R R CP CP S RD S Q RD R CP Q CP S Q0 RD Q Q Q1 S Q Q2 Q3 Q3 FUNCTION TABLE Inputs Operating Modes Outputs MR CP PE J K Dn Q0 Q1 Q2 Q3 Q3 Asynchronous Reset L X X X X X L L L L H Shift, Set First Stage H ↑ h h h X H q0 q1 q2 q2 Shift, Reset First Stage H ↑ h l l X L q0 q1 q2 q2 Shift, Toggle First Stage H ↑ h h l X q0 q0 q1 q2 q2 Shift, Retain First Stage H ↑ h l h X q0 q0 q1 q2 q2 Parallel Load H ↑ l X X dn d0 d1 d2 d3 d3 H = HIGH Voltage Level L = LOW Voltage Level X = Don’t Care dn (qn) = Lower case letters indicate the state of the referenced input (or output) one setup time prior to the LOW-to-HIGH clock transition. ↑ = LOW-to-HIGH clock transition FAST AND LS TTL DATA 4-105 MC74F195 DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol Parameter VIH Input HIGH Voltage VIL Input LOW Voltage VIK Input Clamp Diode Voltage VOH Output HIGH Voltage VOL Output LOW Voltage IIH Input HIGH Current Min Typ Max 2.0 Unit V Guaranteed Input HIGH Voltage 0.8 V Guaranteed Input LOW Voltage –1.2 V IIN = –18 mA VCC = MIN IOH = –1.0 mA VCC = 4.5 V 74 2.5 V 74 2.7 V VCC = 4.75 V 0.5 V IOL = 20 mA VCC = 4.5 V 20 µA VIN = 2.7 V VCC = MAX 100 IIL Input LOW Current IOS Output Short Circuit Current (Note 2) ICC Power Supply Current –60 Test Conditions VIN = 7.0 V –0.6 mA VCC = MAX –150 mA VOUT = 0 V 38 mA VCC = MAX VCC = MAX NOTES: 1. For conditions shown as MIN or MAX, use the appropriate value specified under guaranteed operating ranges. 2. Not more than one output should be shorted at a time, nor for more than 1 second. AC CHARACTERISTICS Symbol Parameter fmax 54/74F 74F TA = + 25°C TA = 0°C to + 70°C VCC = + 5.0 V VCC = 5.0 V ± 10% CL = 50 pF CL = 50 pF Min Max 105 Min Max 90 Unit MHz tPLH Propagation Delay 2.5 7.0 2.5 8.0 tPHL CP to Q/Q 2.5 8.0 2.5 9.0 tPHL Propagation Delay, MR to Q 3.0 10 3.0 11 ns tPLH Propagation Delay, MR to Q 3.0 10.5 3.0 11 ns FAST AND LS TTL DATA 4-106 ns MC74F195 AC OPERATING REQUIREMENTS Symbol ts (H) Parameter th (H) Hold Time, HIGH or LOW J, K, D to CP th (L) ts (H) Setup Time, HIGH or LOW PE to CP ts (L) th (H) Hold Time, HIGH or LOW PE to CP th (L) 74F TA = + 25°C TA = 0°C to + 70°C VCC = + 5.0 V VCC = 5.0 V ± 10% CL = 50 pF CL = 50 pF Min Setup Time, HIGH or LOW J, K, D to CP ts (L) 74F Max Min 4.0 4.0 4.0 4.0 0 1.0 0 1.0 8.0 9.0 8.0 9.0 0 0 Max Unit ns ns ns ns 0 0 tw (H) CP Pulse Width, HIGH 5.0 5.5 ns tw (L) MR Pulse Width, LOW 5.0 5.0 ns trec Recovery Time, MR to CP 7.0 8.0 ns FAST AND LS TTL DATA 4-107