54LS170 NSC | Alldatasheet

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= . 2) A National 4x 4 Register File with Open-Collector Outputs General Description Features The 'LS170 contains 16 high speed, low power, transparent ™ Simultaneous read/write operation D-type latches arranged as four words of four bits each, to ™ ~Expandable to 512 words of n-bits function as a 4 x 4 register file. Separate read and write ™ Typical access time of 20 ns inputs, both address and enable, allow simultaneous read Low leakage open-collector outputs for expansion and write operation. Open-collector outputs make it possible to connect up to 128 outputs in a wired-AND configuration 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 '670 provides a similar function to this de- vice but it features TRI-STATE® outputs. Connection Diagram Logic Symbol 1218 12 3 Dual-in-Line Package 4 OI WE D1 D2 D3 D4 oft 18 Vee 14—1WA0 03-42 TF 13——]WAl Days 14f=wao 5— RAO RAIA 13 wat 4—P1 e_o1 02.03 04 ros. 12;-WE ° os—y6 11 RE 1109 7 6 03-47 10F—o1 TL/F/9820-2 ono 8 i ad Veo = Pin 16 GND = Pin8 TUF /9820-1 Order Number 54LS170DMGB, 54LS170FMQB, DM74LS170WM or DM74LS170N See NS Package Number J16A, M16B, N1GE or W16A D1-D4 Data Inputs WAO-WA1 Write Address Inputs WE Write Enable Input (Active LOW) RAO, RA1 Read Address Inputs RE Read Enable Input (Active LOW) 01-04 Data Outputs 2-208

Absolute Maximum Ratings (note) 3 If Military/Aerospace specified devices are required, Note: The “Absolute Maximum Ratings” are those values ° please contact the National Semiconductor Sales beyond which the safety of the device cannot be guaran- Ottice/Distributors for availability and specifications. teed. The device should not be operated at these limits. The Supply Voltage nv parametric values defined in the “Electrical Characteristics” Input Voltage 40V table are not guaranteed at the absolute maximum ratings. put Voltag The “Recommended Operating Conditions" table will define Operating Free Air Temperature Range the conditions for actual device operation. 54LS —55°C to + 125°C DM74 °C to +70°C Storage Temperature Range —65°C to + 150°C Recommended Operating Conditions Symbol Premera ee unite Vea Supply Voltage pas [os [ss [a [os [sa |v Vin High Level input Voltage a eS Vi Low Level Input Voltage a a a lon High Level Output Current a ee | tou Low Level Output Current Pa ma Ts Free AirOperating Temperature | ss | | vas | o | | 7 | -c ts Setup Time HIGH or LOW Dn to Rising WE 10 10 ns th Hold Time HIGH or LOW ns Dn to Rising WE ts Setup Time HIGH or LOW th Hold Time HIGH or LOW ns WAn to Rising WE wt) WeorREPusewiethrow [as P| Tas Ts

Electrical Characteristics

Over recommended operating free air temperature range (unless otherwise noted) T vi Input Clamp Voltage | Voc = Min, | = —18mA a Vou | High Level Voo=Minlon=Max [sas 20 [Ty Oupevotage | Vi = Max [owe [ar [aa | Vo. | Low Level Voc = Min, lo. = Max, [sus To | Output Voge Vin = Min [owe | | oas [os] v [tox =4mA,Voo=Min [oma | ozs | 0a | if Input Current @ Max Voc = Max, Vj = 10V Dns,AAO,wao | | |__| mA pt Voge [weRe TT oe | im | High Level input Current a a HA he Low Level Input Current | Voc = Max, Vj = 0.4V [Ewe | -o0s | | =o | [patwat | -oos || =04 | ma pata, Rao,wao | 003 [| 0. | los | Short Circuit Voc = Max jews | 20 | = 100 Ouiparcurent | Note) [owe | =20 [100 loc Supply Current Voc = Max, Dn, WE, mA RE = 4.5V, WAn, RAn = GND Note 1: All typicals are at Voc = 5V, Ta = 25°C. Note 2: Not more than one output should be shorted at a time, and the duration should not exceed one second. 2-209

ta] Switching Characteristics Voc = +5.0V, Ta = +265°C, (See Section 1 for waveforms and load configurations) Sympol ee eee ‘“ tPLH Propagation Delay* i” tPHL RAO or RA1 to On. tPLH Propagation Delay tPHL RE toOn ns tPLH Propagation Delay ns tPHL WE to On tPLH Propagation Delay ns tPHL Dn to On “Measured at least 25 ns after entry of new data at selected location. Switching Waveforms wao,wat SAAN OFA AA I th 1-4 \\AAAAAAAA AAA ORAS ty We 4 Vm =1.5¥ "(1.39 for LS) TUF/9820~4 FIGURE a Write Function Table Read Function Table a re] tom | L L L Word 0 L L L Word 0 L L H Word 1 L L H Word 1 L H L Word 2 L H L Word 2 L H H Word 3 L H H Word 3 H x x None (Hold) H x x None (High Z) H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial 2-210