Cn+4 P A=B F U.L. 2.0 U.L. 0.5 U.L. 2.5 U.L. 10 U.L. Open Collector 10 U.L.

Transcription

1 4-IT RITHETIC LOIC UNIT The SN54/LS11 is a 4-bit rithmetic Logic Unit (LU) which can perform all the possible 1 logic, operatio on two variables and a variety of arithmetic operatio. rovides 1 rithmetic Operatio dd, Subtract, Compare, Double, lus Twelve Other rithmetic Operatio rovides all 1 Logic Operatio of Two Variables Exclusive OR, Compare, ND, NND, OR, NOR, lus Ten other Logic Operatio Full Lookahead for High Speed rithmetic Operation on Long Words Input Clamp Diodes SN54/LS11 4-IT RITHETIC LOIC UNIT LOW OWER SCHOTTKY CONNECTION DIR DI (TO VIEW) VCC = F J SUFFIX CERIC CSE N SUFFIX LSTIC CSE S S2 S1 S F0 F1 F2 ND ORDERIN INFORTION NOTE: The atpak version has the same pinouts (Connection Diagram) as the Dual In-Line ackage. SN54LSXXXJ SNLSXXXN Ceramic lastic LOIC SYOL IN NES LODIN (Note a) , 0 S0 S F0 F = Operand (ctive LOW) Inputs Function Select Inputs ode Control Input Carry Input Function (ctive LOW) s Comparator Carry enerator (ctive LOW) Carry ropagate (ctive LOW) Carry HIH 1.5 U.L. 2.0 U.L. 0.5 U.L. 2.5 U.L. Open Collector LOW 0.5 U.L. 1.0 U.L. 0. U.L. 1. U.L. 5 (2.5) U.L. 5 (2.5) U.L. 5 U.L. 5 (2.5) U.L. NOTES: a. 1 TTL Unit Load (U.L.) = 40 µ HIH/1. m LOW. b. The LOW drive factor is 2.5 U.L. for ilitary (54) and 5 U.L. for Commercial () b. Temperature Ranges = S0 S1 S2 S F0 F1 F2 F VCC = IN 24 ND = IN FST ND LS TTL DT 5-1

2 LOIC DIR S0 S 5 1 S 4 2 S VCC = IN 24 ND = IN 12 = IN NUERS F0 F1 = F2 F FUNCTIONL DESCRITION The SN54/LS11 is a 4-bit high speed parallel rithmetic Logic Unit (LU). Controlled by the four Function Select Inputs (S0... S) and the ode Control Input (), it can perform all the 1 possible logic operatio or 1 different arithmetic operatio on active HIH or active LOW operands. The Function Table lists these operatio. When the ode Control Input () is HIH, all internal carries are inhibited and the device performs logic operatio on the individual bits as listed. When the ode Control Input is LOW, the carries are enabled and the device performs arithmetic operatio on the two 4-bit words. The device incorporates full internal carry lookahead and provides for either ripple carry between devices using the output, or for carry lookahead between packages using the signals (Carry ropagate) and (Carry enerate), and are not affected by carry in. When speed requirements are not stringent, the LS11 can be used in a simple ripple carry mode by connecting the Carry () signal to the Carry Input () of the next unit. For high speed operation the LS11 is used in conjunction with the 942 or 9S42 carry lookahead circuit. One carry lookahead package is required for each group of the four LS11 devices. Carry lookahead can be provided at various levels and offers high speed capability over extremely long word lengths. The = output from the LS11 goes HIH when all four F outputs are HIH and can be used to indicate logic equivalence over four bits when the unit is in the subtract mode. The = output is open collector and can be wired-nd with other = outputs to give a comparison for more then four bits. The = signal can also be used with the signal to indicate > and <. The Function Table lists the arithmetic operatio that are performed without a carry in. n incoming carry adds a one to each operation. Thus, select code LHHL generates minus minus 1 (2s complement notation) without a carry in and generates minus when a carry is applied. ecause subtraction is actually performed by complementary addition (1s complement), a carry out mea borrow; thus a carry is generated when there is no underflow and no carry is generated when there is underflow. s indicated, the LS11 can be used with either active LOW inputs producing active LOW outputs or with active HIH inputs producing active HIH outputs. For either case the table lists the operatio that are performed to the operands labeled iide the logic symbol. FST ND LS TTL DT 5-2

3 ODE SELECT INUTS FUNCTION TLE CTIVE LOW INUTS & OUTUTS CTIVE HIH INUTS & OUTUTS S S2 S1 S0 LOIC ( = H) RITHETIC** ( = L) ( = L) LOIC ( = H) RITHETIC** ( = L) ( = H) L L L L minus 1 L L L H minus L L H L + minus 1 + L L H H Logical 1 minus 1 Logical 0 minus 1 L H L L + plus ( + ) plus L H L H plus ( + ) ( + ) plus L H H L minus minus 1 minus minus 1 L H H H + + minus 1 H L L L plus ( + ) + plus H L L H plus plus H L H L plus ( + ) ( + ) plus H L H H + + minus 1 H H L L Logical 0 plus * Logical 1 plus * H H L H plus + ( + ) plus H H H L plus + ( + ) lus H H H H minus 1 L = LOW Voltage Level H = HIH Voltage Level **Each bit is shifted to the next more significant position **rithmetic operatio expressed in 2s complement notation LOIC SYOLS CTIVE LOW OERNDS CTIVE HIH OERNDS S0 S1 S2 S = LS11 4 IT RITHETIC LOIC UNIT F0 F1 F2 F S0 S1 S2 S = LS11 4 IT RITHETIC LOIC UNIT F0 F1 F2 F URNTEED OERTIN RNES Symbol arameter in Typ ax Unit VCC Supply Voltage V T Operating mbient Temperature Range C IOH Current High 54, 0.4 m IOL Current Low m VOH Voltage High ( = only) 54, 5.5 V FST ND LS TTL DT 5-

4 DC CHRCTERISTICS OVER OERTIN TEERTURE RNE (unless otherwise specified) Limits Symbol arameter in Typ ax Unit Conditio i VIH Input HIH Voltage 2.0 V VIL Input LOW Voltage V uaranteed Input HIH Voltage for ll Inputs uaranteed Input LOW Voltage for ll Inputs VIK Input Clamp Diode Voltage V VCC = IN, IIN = 1 m VOH HIH Voltage V VCC = IN, IOH = X, VIN = VIH 2..5 V or VIL per Truth Table LOW Voltage 54, V IOL = 4.0 m Except and V IOL =.0 m VCC = VCC IN, VOL 54, 0. V IOL = 1 m VIN = VIL or VIH per Truth Table V 0.5 IOL =.0 m IOH HIH Current 54, 100 µ VCC = IN, IOH = X, VIN = VIH or VIL per Truth Table IIH IIL Input HIH Current ode Input ny or Input ny S Input Input ode Input ny or Input ny S Input Input Input LOW Current ode Input ny or Input ny S Input Input µ VCC = X, VIN = 2. V IOS Short Circuit Current (Note 2) 100 m VCC = X ICC ower Supply Current 54 See Note 1 4 See Note Note 1. With outputs open, I CC is measured for the following conditio:. S0 through S,, and inputs are at, all other inputs are grounded.. S0 through S and are at, all other inputs are grounded. Note 2: Not more than one output should be shorted at a time, nor for more than 1 second. m m VCC = X, VIN =.0 V VCC = X, VIN = 0.4 V m VCC = X FST ND LS TTL DT 5-4

5 C CHRCTERISTICS (T = C, VCC = 5.0 V, in 12 = ND, CL = pf) Limits Symbol arameter in Typ ax Unit Conditio i ropagation Delay, ( to ) = 0 V, (Sum or Diff ode) See Fig. 4 and Tables I and II ( to F s) 1 2 = 0 V, (Sum ode) See Fig. 4 and Table I ( or Inputs to ) = S1 = S2 = 0 V, S0 = S = (Sum ode) See Fig. 4 and Table I ( or Inputs to ) = S0 = S = 0 V, S1 = S2 = ( or Inputs to ) 0 0 = S1 = S2 = 0 V, S0 = S = (Sum ode) See Fig. 4 and Table I ( or Inputs to ) 22 0 = S0 = S = 0 V, S1 = S2 = (X or X Inputs to FX ) 1 = S1 = S2 = 0 V, S0 = S = (Sum ode) See Fig. 4 and Table I (X or X Inputs to FX ) = S0 = S = 0 V, S1 = S2 = (X or X Inputs to FXH s) 2 = S1 = S2 = 0 V, S0 = S = (Sum ode) See Fig. 4 and Table I (X or X Inputs to FXH s) = S0 = S = 0 V, S1 = S2 = ( or Inputs to F s) 22 2 = (Logic ode) See Fig. 4 and Table III ( or Inputs to ) = 0 V, S0 = S =, S1 = S2 = 0 V (Sum ode) See Fig. and Table I ( or Inputs to ) = 0 V, S0 = S = 0 V, S1 = S2 = (Diff ode) ( or Inputs to = ) = S0 = S = 0 V, S1 = S2 = RL = 2.0 kω C WVEFORS INUT OUTUT Figure 4 INUT INUT INUT OUTUT OUTUT Figure 5 Figure FST ND LS TTL DT 5-5

6 SU ODE TEST TLE I arameter Input Other Input Same it ND l l None FUNCTION INUTS: S0 = S =, S1 = S2 = = 0 V and Other Data Inputs ND l l None and l l None and l l None and None None None None None, None, None, None, None None ll ll ny F or FST ND LS TTL DT 5-

7 DIFF ODE TEST TLE II arameter Input Other Input Same it ND None FUNCTION INUTS: S1 = S2 =, S0 = S = = 0 V Other Data Inputs ND, None, l None l, l l None, None None None None None None and l, None None None, = None, = None None cn+4 None None None None ll and None LOIC ODE TEST TLE III arameter Input Other Input Same it ND Other Data Inputs None None ND ny F Function Inputs S1 = S2 = = S0 = S = 0 V None None ny F S1 = S2 = = S0 = S = 0 V FST ND LS TTL DT 5-