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SN74LS228 Datasheet(PDF) 6 Page - Texas Instruments |
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SN74LS228 Datasheet(HTML) 6 Page - Texas Instruments |
6 / 10 page SN74LS228 16 × 4 SYNCHRONOUS FIRST-IN, FIRST-OUT MEMORY WITH OPEN-COLLECTOR OUTPUTS SDLS024 – JANUARY 1991 – REVISED SEPTEMBER 1993 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 10–6 recommended operating conditions (see Note 2) MIN NOM MAX UNIT VCC Supply voltage 4.75 5 5.25 V VIH High-level input voltage 2 V VIL Low-level input voltage 0.8 V VOH High-level output voltage Q outputs 5.5 V IOH High-level output current IR, OR – 0.4 mA IOL Low level output current Q outputs 24 mA IOL Low-level output current IR, OR 8 mA LDCK high 60 LDCK low 15 tw Pulse duration UNCK low 30 ns UNCK high 30 CLR low 20 Data to LDCK ↓ 50 tsu Setup time LDCK ↓ before UNCK↓ 50 ns UNCK ↑ before LDCK↑ 50 th Hold time Data from LDCK ↓ 0 ns TA Operating free-air temperature 0 70 °C NOTE 2: To ensure proper operation of this high-speed FIFO device, it is necessary to provide a clean signal to the LDCK and UNCK clock inputs. Any excessive noise or glitching on the clock inputs that violates the VIL, VIH, or minimum pulse duration limits can cause a false clock or improper operation of the internal read and write pointers. electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP† MAX UNIT VIK VCC = 4.75 V, II = – 18 mA – 1.5 V IOH Q outputs VCC = 4.75 V, VOH = 5.5 V 0.1 mA VOH IR, OR VCC = 4.75 V, IOH = – 0.4 mA 2.7 3.4 V Q outputs VCC = 4 75 V IOL = 12 mA 0.25 0.4 VOL Q outputs VCC = 4.75 V IOL = 24 mA 0.35 0.5 V VOL IR OR VCC = 4 75 V IOL = 4 mA 0.25 0.4 V IR, OR VCC = 4.75 V IOL = 8 mA 0.35 0.5 IOZH Q outputs VCC = 5.25 V, VO = 2.7 V 20 µA IOZL Q outputs VCC = 5.25 V, VO = 0.4 V –20 µA II VCC = 5.25 V, VI = 7 V 0.1 mA IIH VCC = 5.25 V, VI = 2.7 V 20 µA IIL VCC = 5.25 V, VI = 0.4 V – 0.4 mA IOS‡ IR, OR VCC = 5.25 V –20 – 100 mA Outputs high 84 135 ICC VCC = 5.25 V Outputs low 87 155 mA Outputs disabled 89 155 † All typical values are at VCC = 5 V, TA = 25°C. ‡ Not more than one output should be shorted at a time, and duration of the short circuit should not exceed one second. |
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