TECHNICAL DATA KK74LS245 Octal 3-State Noninverting Bus Transceiver These octal bus transceiver are designed for asynchronous two-way communication between data buses. The control function implementation minimized external timing requirements. The device allows data transmission from the A bus to the B bus or from the B bus to the A bus depending upon the logic level at the directional control (DIR) input. The enable input(E) can be used to disable the device so that the buses are effectively isolated. • Bidirectional Bus Transceiver in a High-Density 20-Pin Package • 3-state Outputs Dirve Bus Lines Directly • P-N-P Inputs D-C Loading on Bus Lines • Hysteresis at Bus Inputs Improve Noise Margins • Typical Propagation Delay Times; Port to Port ... 8 ns ORDERING INFORMATION KK74LS245N Plastic KK74LS245DW SOIC TA = 0° to 70° C for all packages PIN ASSIGNMENT LOGIC DIAGRAM FUNCTION TABLE Control Inputs PIN 20=VCC PIN 10 = GND Output Enable Direction Operation L L Data Transmitted from Bus B to Bus A L H Data Transmitted from Bus A to Bus B H X Buses Isolated (High Impedance State) X = don’t care 1 KK74LS245 MAXIMUM RATINGS* Symbol Parameter Value Unit VCC Supply Voltage 7.0 V VIN Input Voltage 7.0 V VOUT Output Voltage 5.5 V Tstg Storage Temperature Range -65 to +150 °C * Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the Recommended Operating Conditions. RECOMMENDED OPERATING CONDITIONS Symbol Parameter Min Max Unit 5.25 V VCC Supply Voltage 4.75 VIH High Level Input Voltage 2.0 VIL Low Level Input Voltage 0.8 V IOH High Level Output Current -15 mA IOL Low Level Output Current 24 mA TA Ambient Temperature Range +70 °C 0 V DC ELECTRICAL CHARACTERISTICS over full operating conditions Guaranteed Limit Symbol Parameter Test Conditions Min VIK Input Clamp Voltage VCC = min, IIN = -18 mA VOH High Level Output Voltage VCC = min, IOH = -1.0 mA 2.7 VCC = min, IOH = -3.0 mA 2.4 VCC = min, IOH = -15 mA 2.0 VOL VT+ - VT- Low Level Output Voltage Max Unit -1.5 V V VCC = min, IOL = 12 mA 0.4 VCC = min, IOL = 24 mA 0.5 0.2 V Hysteresis VCC = min V IOZH Output Off Current HIGH VCC = max, VOUT = 2.7 V 20 µA IOZL Output Off Current LOW VCC = max, VOUT = 0.4 V -0.2 mA IIH High Level Input Current VCC = max, VIN = 2.7 V 20 µA VCC = max, VIN = 5.5 V (A or B) 0.1 mA VCC = max, VIN = 7.0 V for Pin1, Pin 19 0.1 -0.2 mA -225 mA mA IIL Low Level Input Current VCC = max, VIN = 0.4 V IO Output Short Circuit Current VCC = max, VO =0 V (Note 1) ICC Supply Outputs High VCC = max 70 Current Outputs Low Outputs open 90 -40 All outputs disable 95 Note 1: Not more thanone output should be shorted at a time, and duration of the short-circuit should not exceed one second. 2 KK74LS245 AC ELECTRICAL CHARACTERISTICS (TA = 25°C, VCC = 5.0 V, tr = 15 ns,, tf = 6.0 ns) Symbol Parameter Test Condition Min Max Unit 12 ns 12 ns tPLH Propagation Delay Time, Low-to-High Level Output (from A or B to Output) tPHL Propagation Delay Time, High-to-Low Level Output (from A or B to Output) tPZH Output Enable Time to High Level (from OE to Output) 40 ns tPZL Output Enable Time to Low Level (from OE to Output) 40 ns tPHZ Output Disable Time from High Level (from OE to Output) 25 ns 25 ns tPLZ Output Disable Time from Low Level (from OE to Output) CL = 45 pF, RL = 667 Ω CL = 5 pF RL = 667 Ω tPZL - S1 closed, S2 opened tPZH- S1 opened, S2 closed tPLZ, tPHZ - S1 and S2 closed Figure 1. Switching Waveforms (See Figure 3) NOTES A. CL includes probe and jig capacitance. B. All diodes are 1N916 or 1N3064. Figure 3. Test Circuit Figure 2. Switching Waveforms (See Figure 4) NOTES A. CL includes probe and jig capacitance. B. All diodes are 1N916 or 1N3064. Figure 4. Test Circuit 3 KK74LS245 EXPANDED LOGIC DIAGRAM 4 KK74LS245 N SUFFIX PLASTIC DIP (MS - 001AD) A Dimension, mm 11 20 B 1 10 Symbol MIN MAX A 24.89 26.92 B 6.1 7.11 5.33 C F L C -T- SEATING PLANE D 0.36 0.56 F 1.14 1.78 G 2.54 H 7.62 N G K M J H D 0.25 (0.010) M T NOTES: 1. Dimensions “A”, “B” do not include mold flash or protrusions. Maximum mold flash or protrusions 0.25 mm (0.010) per side. J 0° 10° K 2.92 3.81 L 7.62 8.26 M 0.2 0.36 N 0.38 D SUFFIX SOIC (MS - 013AC) A 20 11 H Dimension, mm B 1 P 10 G R x 45 C -TK D SEATING PLANE J 0.25 (0.010) M T C M NOTES: 1. Dimensions A and B do not include mold flash or protrusion. 2. Maximum mold flash or protrusion 0.15 mm (0.006) per side for A; for B ‑ 0.25 mm (0.010) per side. F M Symbol MIN MAX A 12.6 13 B 7.4 7.6 C 2.35 2.65 D 0.33 0.51 F 0.4 1.27 G 1.27 H 9.53 J 0° 8° K 0.1 0.3 M 0.23 0.32 P 10 10.65 R 0.25 0.75 5