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TMS27C240 Datasheet(PDF) 3 Page - Texas Instruments |
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TMS27C240 Datasheet(HTML) 3 Page - Texas Instruments |
3 / 15 page TMS27C240 262144 BY 16-BIT UV ERASABLE TMS27PC240 262144 BY 16-BIT PROGRAMMABLE READ-ONLY MEMORIES SMLS240D– NOVEMBER 1990 – REVISED SEPTEMBER 1997 3 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443 description (continued) The TMS27PC240 OTP PROM is offered in a 44-lead plastic leaded chip carrier package using 1,25-mm (50-mil) lead spacing ( FN suffix). The TMS27PC240 is offered with two choices of temperature ranges of 0 °C to 70 °C (FNL suffix) and –40°C to 85°C (FNE suffix). See Table 1. Table 1. Temperature Range Suffixes SUFFIX FOR OPERATING FREE- AIR TEMPERATURE RANGES 0 °C TO 70°C –40 °C TO 85°C TMS27C240-XXX JL JE TMS27PC240-XXX FNL FNE These EPROMs and OTP PROMs operate from a single 5-V supply ( in the read mode), and they are ideal for use in microprocessor-based systems. One other (13 V) supply is needed for programming . All programming signals are TTL level. For programming outside the system, existing EPROM programmers can be used. operation The eight modes of operation for the TMS27C240 and TMS27PC240 are listed in Table 2. The read mode requires a single 5-V supply. All inputs are TTL level except for VPP during programming (13 V for SNAP! Pulse), and 12 V on A9 for the signature mode. Table 2. Operation Modes FUNCTION † E G VPP VCC A9 A0 I/O Read VIL VIL VCC VCC X X DQ0 – DQ7 DQ8 – DQ15 Output Disable VIL VIH VCC VCC X X Hi-Z Standby VIH X VCC VCC X X Hi-Z Programming VIL VIH VPP VCC X X Data In Verify VIH VIL VPP VCC X X Data Out Program Inhibit VIH VIH VPP VCC X X Hi-Z Signature Mode (Mfg) VIL VIL VCC VCC VH‡ VIL Manufacturer’s Code 0097 Signature Mode (Device) VIL VIL VCC VCC VH‡ VIH Device Code 0030 † X can be VIL or VIH. ‡ VH = 12 V ± 0.5 V. read / output disable When the outputs of two or more TMS27C240s or TMS27PC240s are connected in parallel on the same bus, the output of any particular device in the circuit can be read with no interference from the competing outputs of the other devices. To read the output of a single device, a low-level signal is applied to the E and G pins. All other devices in the circuit should have their outputs disabled by applying a high-level signal to one of these pins. |
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