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| 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. 4 x 4 REGISTER FILE WITH 3-STATE OUTPUTS LOW POWER SCHOTTKY * * * * * 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 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 10 Q2 9 NOTE: The Flatpak version has the same pinouts (Connection Diagram) as the Dual In-Line Package. 16 1 N SUFFIX PLASTIC CASE 648-08 16 1 D SUFFIX SOIC CASE 751B-03 1 D2 2 D3 3 D4 4 RB 5 RA 6 Q4 7 Q3 8 GND ORDERING INFORMATION PIN NAMES LOADING (Note a) HIGH D1 - D4 WA, WB EW RA, RB ER Q 1 - Q4 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. SN54LSXXXJ SN74LSXXXN SN74LSXXXD Ceramic Plastic SOIC LOGIC SYMBOL 12 14 13 5 4 15 1 2 3 NOTES: a) 1 TTL Unit Load (U.L.) = 40 A 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. WA EW D1 D2 D3 D4 WB RA RB ER Q1 Q2 Q3 Q4 11 10 9 7 VCC = PIN 16 GND = PIN 8 6 FAST AND LS TTL DATA 5-1 SN54/74LS670 LOGIC DIAGRAM D4 12 3 D3 2 D2 1 D1 15 EW 13 WB 14 WA WORD 0 G Q D G Q D G Q D G Q D G Q D G Q D G Q D G Q D WORD 1 WORD 2 G Q D G Q D G Q D G Q D WORD 3 G Q 4 D G Q D G Q D G Q D RB 11 ER 5 RA 6 7 9 10 Q4 Q3 Q2 Q1 VCC = PIN 16 GND = PIN 8 = PIN NUMBERS FAST AND LS TTL DATA 5-2 SN54/74LS670 GUARANTEED OPERATING RANGES Symbol VCC TA IOH IOL Supply Voltage Operating Ambient Temperature Range Output Current -- High Output Current -- Low Parameter 54 74 54 74 54 74 54 74 Min 4.5 4.75 - 55 0 Typ 5.0 5.0 25 25 Max 5.5 5.25 125 70 -1.0 -2.6 12 24 Unit V C mA mA DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol S bl VIH VIL VIK VOH Parameter P Input HIGH Voltage 54 Input LOW Voltage 74 Input Clamp Diode Voltage 54 Output HIGH Voltage 74 54, 74 VOL IOZH IOZL Output LOW Voltage 74 Output Off Current HIGH Output Off Current LOW Input HIGH Current D, R, W EW ER D, R, W EW ER Input LOW Current D, R, W EW ER Short Circuit Current (Note 1) Power Supply Current - 30 0.35 0.5 20 -20 20 40 60 0.1 0.2 0.3 - 0.4 - 0.8 -1.2 - 130 50 V A A A 2.4 3.1 0.25 0.4 V V 2.4 - 0.65 3.4 0.8 - 1.5 V V Min 2.0 0.7 V Typ Max Unit Ui V Test C di i T Conditions Guaranteed Input HIGH Voltage for All Inputs Guaranteed Input LOW Voltage for p g All Inputs VCC = MIN, IIN = - 18 mA VCC = MIN, IOH = MAX, VIN = VIH , , or VIL per Truth Table IOL = 12 mA IOL = 24 mA VCC = VCC MIN, VIN = VIL or VIH per Truth Table VCC = MAX, VO = 2.7 V VCC = MAX, VO = 0.4 V VCC = MAX, VIN = 2.7 V IIH mA VCC = MAX, VIN = 7.0 V IIL mA VCC = MAX, VIN = 0.4 V IOS ICC mA mA VCC = MAX VCC = MAX 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 = 25C) Limits Symbol S bl tPLH tPHL tPLH tPHL tPLH tPHL tPZH tPZL tPLZ tPHZ Parameter P Propagation Delay, RA or RB to Output Propagation Delay, EW to Output Propagation Delay, Data to Output Output Enable Time Output Disable Time Min Typ 23 25 26 28 25 23 15 22 16 30 Max 40 45 45 50 45 40 35 40 35 50 Unit Ui ns ns ns ns ns CL = 5.0 pF Test C di i T Conditions VCC = 5.0 V, 5 0 V, CL = 45 pF AC SETUP REQUIREMENTS (TA = 25C) Limits Symbol S bl tW ts ts th th trec Pulse Width Setup Time, (D) Setup Time, (W) Hold Time, (D) Hold Time, (W) Recovery Time Parameter P Min 25 10 15 15 5.0 25 Typ Max Unit Ui ns ns ns ns ns ns VCC = 5 0 V 5.0 Test C di i T Conditions AC WAVEFORMS D, EW 1.3 V tPHL 1.3 V tPLH 1.3 V 1.3 V RA, RB 1.3 V tPHL 1.3 V tPLH 1.3 V 1.3 V Q Q Figure 1 Figure 2 WA, WB 1.3 V ts 1.3 V th 1.3 V 1.3 V ts th 1.3 V D tW EW 1.3 V Figure 3 FAST AND LS TTL DATA 5-4 |
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