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Details, datasheet, quote on part number:S-29230A
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Datasheet text preview:
S-29 & S-93C SERIES EEPROMs TIPS, TRICKS & TRAPS
KO
Seiko Instruments Inc.
Contents
1. Tip: Add a resistor to the input terminals ... 1 2. Tip: Input / Output terminal equivalent....... 1 3. Tip: Program disable instruction....... 3 4. Tip: Applying the supply voltage....... 3 4-1. To secure correct operation of power-on clear circuit .. 3 4-2. Trap: Wait for the initialization sequence to complete.. 5 4-3. Trap: Problems in the power-on clear circuit....... 6 5. Trap: Precaution on the data write ........ .... 7 6. Trap: " rite verify operation"....... .... 9 W . 7. Trick: Suppressing noise at the input terminals........ 9 8. Trap: Severe environments ........ ...... 10
TIPS, TRICKS, & TRAPS WHEN USING THE S-29 & S-93C SERIES EEPROMs This application note describes tips, tricks, and traps to help the design engineer prevent errors and get maximum performance when using Seiko Instruments S-29 & S-93C series EEPROMs. SII manufactures a wide range of EEPROMs including models that are pin-for-pin compatible with industry standard 93CXX and 93C(S)XX (same instruction code). All EEPROMs (from any manufacturer) may experience a "write" error due to: · operation in a low voltage region during power-on / power-off; · noise signals causing an error in acknowledging an instruction. These errors frequently occur when the operating voltage drops below the microcomputer' minimum operating voltage. Based on the s manufacturer' circuit design, certain steps can be taken by the s designer to prevent these errors. 1. Tip: Add a resistor to the input teminals. All the input terminals for the S-29 & S-93C series have a CMOS structure which can produce write errors in a high impedance condition (open terminal). Add either a "pull-up" or a "pull-down" resistor per Table 1:
Representative EEPROM model:
S-29130A & S-93C46A
S-29194A __ Active low (CS) 10K - 100K ohms pull-up
CS terminal condition: Resistor:
Active high (CS) 10K - 100K ohms pull-down Table 1 To prevent "write" errors, it is recommended that a pull-up or pulldown resistor be added to the CS terminals. For best operation, add the same resistor to the other EEPROM input terminals. 2. Tip: Input / Output terminal equivalent circuit. The input terminals have no built-in pull-up or pull-down resistor. The output terminal provides a tri-state output (high level, low level, and high impedance). Equivalent circuits are shown in Tables 2 - 5:
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