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TMS27C256-15JE Datasheet(PDF) 7 Page - Texas Instruments |
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TMS27C256-15JE Datasheet(HTML) 7 Page - Texas Instruments |
7 / 13 page TMS27C256 32768 BY 8-BIT UV ERASABLE TMS27PC256 32768 BY 8-BIT PROGRAMMABLE READ-ONLY MEMORIES SMLS256H– SEPTEMBER 1984 – REVISED NOVEMBER 1997 7 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443 recommended operating conditions MIN NOM MAX UNIT VCC Supply voltage Read mode (see Note 2) 4.5 5 5.5 V VCC Supply voltage SNAP! Pulse programming algorithm 6.25 6.5 6.75 V VPP Supply voltage Read mode VCC – 0.6 VCC+0.6 V VPP Supply voltage SNAP! Pulse programming algorithm 12.75 13 13.25 V VIH High level dc input voltage TTL 2 VCC+1 V VIH High-level dc input voltage CMOS VCC – 0.2 VCC+1 V VIL Low level dc input voltage TTL – 0.5 0.8 V VIL Low-level dc input voltage CMOS – 0.5 0.2 V TA Operating free-air temperature ’27C256-_ _JL ’27PC256-_ _FML 0 70 °C TA Operating free-air temperature ’27C256-_ _JE ’27PC256-_ _FME –40 85 °C NOTE 2: VCC must be applied before or at the same time as VPP and removed after or at the same time as VPP. The device must not be inserted into or removed from the board when VPP or VCC is applied. electrical characteristics over recommended ranges of operating conditions PARAMETER TEST CONDITIONS MIN TYP† MAX UNIT VOH High level dc output voltage IOH = – 2.5 mA 3.5 V VOH High-level dc output voltage IOH = – 20 µA VCC – 0.1 V VOL Low level dc output voltage IOL = 2.1 mA 0.4 V VOL Low-level dc output voltage IOL = 20 µA 0.1 V II Input current (leakage) VI = 0 V to 5.5 V ±1 µA IO Output current (leakage) VO = 0 V to VCC ±1 µA IPP1 VPP supply current VPP = VCC = 5.5 V 1 10 µA IPP2 VPP supply current (during program pulse) VPP = 13 V 35 50 mA ICC1 VCC supply current TTL-input level VCC = 5.5 V, E = VIH 250 500 µA ICC1 CC y (standby) CMOS-input level VCC = 5.5 V, E = VCC 100 250 µA ICC2 VCC supply current (active) VCC = 5.5 V, E = VIL, tcycle = minimum cycle time, outputs open 15 30 mA capacitance over recommended ranges of supply voltage and operating free-air temperature, f = 1 MHz† PARAMETER TEST CONDITIONS MIN TYP‡ MAX UNIT Ci Input capacitance VI = 0, f = 1 MHz 6 10 pF Co Output capacitance VO = 0, f = 1 MHz 10 14 pF † Capacitance measurements are made on a sample basis only. ‡ Typical values are at TA = 25°C and nominal voltages. |
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