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74LS670

ON Semiconductor
Part Number 74LS670
Manufacturer ON Semiconductor
Description LOW-POWER SCHOTTKY
Published Apr 23, 2005
Detailed Description SN74LS670 4 x 4 Register File with 3-State Outputs The TTL / MSI SN74LS670 is a high-speed, low-power 4 x 4 Register Fil...
Datasheet PDF File 74LS670 PDF File

74LS670
74LS670

Overview
SN74LS670 4 x 4 Register File with 3-State Outputs The TTL / MSI SN74LS670 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.
http://onsemi.
com • • • • • 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 LOW POWER SCHOTTKY GUARANTEED OPERATING RANGES Symbol VCC TA IOH IOL Parameter Supply Voltage Operating Ambient Temperature Range Output Current – High Output Current – Low Min 4.
75 0 Typ 5.
0 25 Max 5.
25 70 – 2.
6 24 Unit V °C mA mA 16 1 PLASTIC N SUFFIX CASE 648 16 1 SOIC D SUFFIX CASE 751B ORDERING INFORMATION Device SN74LS670N SN74LS670D Package 16 Pin DIP 16 Pin Shipping 2000 Units/Box 2500/Tape & Reel © Semiconductor Components Industries, LLC, 1999 1 December, 1999 – Rev.
6 Publication Order Number: SN74LS670/D SN74LS670 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.
1 D2 2 D3 3 D4 4 RB 5 RA 6 Q4 7 Q3 8 GND LOADING (Note a) PIN NAMES D1 – D4 WA, WB EW RA, RB ER Q1 – Q4 Data Inputs Write Address Inputs Write Enable (Active LOW) Input Read Address Inputs Read Enable (Active LOW) Input Outputs HIGH 0.
5 U.
L.
0.
5 U.
L.
1.
0 U.
L.
0.
5 U.
L.
1.
5 U.
L.
65 U.
L.
LOW 0.
25 U.
L.
0.
25 U.
L.
0.
5 U.
L.
0.
25 U.
L.
0.
75 U.
L.
15 U.
L.
NOTES: a) 1 TTL Unit Load (U.
L.
) = 40 mA HIGH/1.
6 mA LOW.
LOGIC SYMBOL 12 14 13 5 4 WA EW WB RA RB ER 11 15 1 2 3 D1 D2 D3 D4 Q1 Q2 Q3 Q4 10 9 7 6 VCC = PIN 16 GND = PIN 8 http://onsemi.
com 2 SN74LS670 LOGIC DIAGRAM D4 12 3 D3 2 D2 1 D1 15 EW 13 WB 14 WA WORD 0 G...


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