T4773 TOSHIBA | Alldatasheet
Document overview
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Technical content
The T4773 is a CMOS ultraviolet light Erasable and Electrically Programmable Read Only Memory consisting of 32768 x 8bits.
FEATURES
@Accesstime: 200ns 32-LCC @High speed programming mode (Leadiess Chip Carrier) @Programming voltage: 12.5V Fully static operation @Stand-by current: 100pA max. (at 85°C) wb Rs @ Equivalent to TC57256AD-20 ¢ ecg ' 14773 PIN ASSIGNMENT (TOP VIEW) PIN FUNCTION are i Sene qdqzod loo [) AB-» | 25) 116] Ds VCC | 28: n3) N.C aizo (31 ho D1 vp Program power supply TTd?tt ttt GND ov qdqddqddddez OPERATION MODE a 9-1
ELECTRICAL CHARACTERISTICS
W/O pin Voltage Vuo -0.6 toVec +05 (1) Read operation RECOMMENDED OPERATING CONDITIONS i D.C. CHARACTERISTICS (Vs5 = OV, Vcc = 4.5 to 5.5V, Topr = ~ 40 to 85°C) pe Supply Current (in the normal mode) Supply Current (in the stand-by mode) 920390 _—— 9-2
A.C. Test Conditions * Outputload 1TTL Gate, C. = 100pF * Input pulse rising time 10ns max ¢ Input pulse level 0.45V to 2.4V « Reference level for timing measurement Input 0.8V, 2.2V, Output 0.8V, 2.0V tee ton, FY | LM oe gt tory MW TLL oe | WMG | LIMA. tace | Len _,| le, (2) Program Operation | RECOMMENDED OPERATING CONDITIONS input High Voltage Vin | 22 L- Vee + 1.0 v Input Low Voltage Vi + -03 L- 08 J ov 020390 9-3
D.C. CHARACTERISTICS fence Powe Pee fo | [0 |v | Supply Current be fe acs [ A.C. CHARACTERISTICS | dS Jo ee ys Address Hold Time tan | [2 | - | - | aaonnd ps CE=Vn, OF = Vin ms OE to Output Data Valid Time toe _ oo CE= Vin GF to Output Data High Impedance Time tore A.C. Test Conditions © Outputload iTTL Gate, C. = 100pF @ Input pulse rising/falling time : 10ns max. @ input pulse levels : 0.45V to 2.4V © Timing measurement Referance level : Input 0.8V, 2.2V, Output 0.8V, 2.2V Note. Overprogram pulse width varies accoding to the pulse width required for the initial program 9-4
RRO — | «tore ford — ton stagte fs vee ‘ves vec tyes PROGRAM PROGRAM VERIFY Note 1. Turn on the VPP power supply (12.5V) at the same time as or later than the VCC power supply. Turn off the VPP power supply at the same time as or earlier than the VCC power supply. Note2. Do not remove or set the device under the condition of VPP = 12.5+0.5V. If removed or set, it might be damaged. Note 3. Should not be applied voltage over 14V to the VPP pin during programming (include the overshoot voltage) The electrical characteristics of the T4773 is identical to those of the TC57256AD-20. Also refer to the | technical data sheets of the TC57256AD-20 o0n90 SCS 9-5