SN54LS670J

SN54/74LS670 4 x 4 REGISTER FILE WITH 3-STATE OUTPUTS The TTL / MSI SN54 / 74LS670 is a high-speed, low-power 4 x 4 Register File organized as four words by four bits. Separate read and write inputs, both address and enable, allow simultaneous read and write operation. The 3-state outputs make it possible to connect up to 128 outputs to increase the word capacity up to 512 words. Any number of these devices can be operated in parallel to generate an n-bit length. The SN54 / 74LS170 provides a similar function to this device but it features open-collector outputs. • • • • • Simultaneous Read / Write Operation Expandable to 512 Words by n-Bits Typical Access Time to 20 ns 3-State Outputs for Expansion Typical Power Dissipation of 125 mW 4 x 4 REGISTER FILE WITH 3-STATE OUTPUTS LOW POWER SCHOTTKY J SUFFIX CERAMIC CASE 620-09 16 1 CONNECTION DIAGRAM DIP (TOP VIEW) VCC 16 D1 15 WA 14 WB 13 EW 12 ER 11 Q1 Q2 10 9 N SUFFIX PLASTIC CASE 648-08 16 1 NOTE: The Flatpak version has the same pinouts (Connection Diagram) as the Dual In-Line Package. D SUFFIX SOIC CASE 751B-03 16 1 1 D2 2 D3 3 D4 4 RB 5 RA 6 Q4 7 Q3 8 GND ORDERING INFORMATION PIN NAMES HIGH D1 – D4 WA, WB EW RA, RB ER Q 1 – Q4 SN54LSXXXJ SN74LSXXXN SN74LSXXXD LOADING (Note a) Data Inputs Write Address Inputs Write Enable (Active LOW) Input Read Address Inputs Read Enable (Active LOW) Input Outputs (Note b) 0.5 U.L. 0.5 U.L. 1.0 U.L. 0.5 U.L. 1.5 U.L. 65 (25) U.L. LOW 0.25 U.L. 0.25 U.L. 0.5 U.L. 0.25 U.L. 0.75 U.L. 15 (7.5) U.L. NOTES: a) 1 TTL Unit Load (U.L.) = 40 µA HIGH/1.6 mA LOW. b) The Output LOW drive factor is 7.5 U.L. for Military (54) and 15 U.L. for Commercial (74) Temperature Ranges. The Output HIGH drive factor is 25 U.L. for Military and 65 U.L. for Commercial Temperature Ranges. Ceramic Plastic SOIC LOGIC SYMBOL 12 14 13 5 4 15 1 2 3 WA EW D1 D2 D3 D4 WB RA RB ER Q1 Q2 Q3 Q4 11 10 9 7 VCC = PIN 16 GND = PIN 8 FAST AND LS TTL DATA 5-1 6 SN54/74LS670 LOGIC DIAGRAM D4 D3 3 12 D2 2 D1 15 1 EW 13 WB 14 WA WORD 0 G D G Q G D G Q D G Q D G Q D G Q D Q D G Q WORD 1 D Q WORD 2 G D G Q D G Q D G Q D Q WORD 3 G D G Q D G Q D G Q D Q 4 RB 11 ER 5 RA 6 7 Q4 Q3 VCC = PIN 16 GND = PIN 8 = PIN NUMBERS FAST AND LS TTL DATA 5-2 9 Q2 10 Q1 SN54/74LS670 GUARANTEED OPERATING RANGES Symbol Parameter Min Typ Max Unit VCC Supply Voltage 54 74 4.5 4.75 5.0 5.0 5.5 5.25 V TA Operating Ambient Temperature Range 54 74 – 55 0 25 25 125 70 °C IOH Output Current — High 54 74 –1.0 –2.6 mA IOL Output Current — Low 54 74 12 24 mA DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits S b l Symbol Min P Parameter VIH Input HIGH Voltage VIL Input LOW Voltage VIK Input Clamp Diode Voltage VOH Output HIGH Voltage VOL Output LOW Voltage IOZH Typ Max U i Unit 2.0 54 0.7 74 0.8 – 0.65 – 1.5 T Test C Conditions di i V Guaranteed Input HIGH Voltage for All Inputs V Guaranteed Input p LOW Voltage g for All Inputs V VCC = MIN, IIN = – 18 mA 54 2.4 3.4 V 74 2.4 3.1 V VCC = MIN,, IOH = MAX,, VIN = VIH or VIL per Truth Table VCC = VCC MIN, VIN = VIL or VIH per Truth Table 54, 74 0.25 0.4 V IOL = 12 mA 74 0.35 0.5 V IOL = 24 mA Output Off Current HIGH 20 µA VCC = MAX, VO = 2.7 V IOZL Output Off Current LOW –20 µA VCC = MAX, VO = 0.4 V 20 40 60 µA VCC = MAX, VIN = 2.7 V IIH Input HIGH Current D, R, W EW ER mA VCC = MAX, VIN = 7.0 V mA VCC = MAX, VIN = 0.4 V – 130 mA VCC = MAX 50 mA VCC = MAX D, R, W EW ER IIL Input LOW Current D, R, W EW ER IOS Short Circuit Current (Note 1) ICC Power Supply Current 0.1 0.2 0.3 – 0.4 – 0.8 –1.2 – 30 Note 1: Not more than one output should be shorted at a time, nor for more than 1 second. FAST AND LS TTL DATA 5-3 SN54/74LS670 AC CHARACTERISTICS (TA = 25°C) Limits S b l Symbol P Parameter Min Typ Max U i Unit T Test C Conditions di i tPLH tPHL Propagation Delay, RA or RB to Output 23 25 40 45 ns tPLH tPHL Propagation Delay, EW to Output 26 28 45 50 ns tPLH tPHL Propagation Delay, Data to Output 25 23 45 40 ns tPZH tPZL Output Enable Time 15 22 35 40 ns tPLZ tPHZ Output Disable Time 16 30 35 50 ns CL = 5.0 pF Max U i Unit T Test C Conditions di i 5 0 V, V, VCC = 5.0 CL = 45 pF AC SETUP REQUIREMENTS (TA = 25°C) Limits S b l Symbol P Parameter Min Typ tW Pulse Width 25 ns ts Setup Time, (D) 10 ns ts Setup Time, (W) 15 ns th Hold Time, (D) 15 ns th Hold Time, (W) 5.0 ns trec Recovery Time 25 ns VCC = 5 5.0 0V AC WAVEFORMS D, EW 1.3 V 1.3 V tPHL RA, RB tPLH 1.3 V 1.3 V Q 1.3 V 1.3 V tPHL tPLH 1.3 V Q Figure 2 Figure 1 WA, WB 1.3 V 1.3 V ts th 1.3 V 1.3 V D tW EW ts 1.3 V th 1.3 V Figure 3 FAST AND LS TTL DATA 5-4 1.3 V