D A T A S H E E T

Signetics FULLY ENCODED, 9046xN, RANDOM ACCESS WRITE-ONLY MEMORY 25120

FINAL SPECIFICATION [10]

DESCRIPTION

The Signetics 25000 Series 9046XN Random Access Write-Only-Memory employs both enhanced and depletion mode P-Channel, N-Channel and neu [1] channel MOS devices. Although a static device, a single TTL level clock phase is required to drive the on-board multi-port clock generator. Data refresh is accomplished during CB and LH periods [11]. Quadri-state outputs (when applicable) allow expansion in many directions, depending on organization.

The static memory cells are operated dynamically to yield extremely low power dissipation. All inputs and outputs are directly TTL compatible when proper interfacing circuitry is employed.

Device constuction is more or less S.O.S. [2].

FEATURES

FULLY ENCODED MULTIPORT- ADRESSING
WRITE CYCLE TIME 80 nS (MAX. TYPICAL)
WRITE ACCESS TIME [3]
POWER DISSIPATION 10 uW/BIT TYPICAL
CELL REFRESH TIME 2 mS (MIN. TYPICAL)
TTL/DTL COMPATIBLE INPUTS [4]
AVAILABLE OUTPUTS "n"
CLOCK LINE CAPACITANCE 2pF MAX. [5]
V_CC=+10 V
V_DD= 0V +- 2%
V_FF= 6,3Vac [6]

APPLICATIONS

DON'T CARE BUFFER STORES
LEAST SIGNIFICANT CONTROL MEMORIES
POST MORTEM MEMORIES (WEAPON SYSTEMS)
ARTIFICIAL MEMORY SYSTEMS
NON-INTELLIGENT MICRO CONTROLLERS
FIRST-IN NEVER-OUT (FINO) ASYNCHRONOUS BUFFERS
OVERFLOW REGISTER (BIT BUCKET)

PROCESS TECHNOLOGY

The use of Signetics unique SEX [7] process yields Vth (var.) and allows the design [8] and production [9] of higher performance MOS circuits than can be obtained by competitor's techniques.

BIPOLAR COMPATIBILITY

All data and clock inputs plus applicable outputs will interface directly or nearly directly with bipolar circuits of suitable characteristics. In any event use 1 amp fuses in all power supply and data lines.

INPUT PROTECTION

All terminals are provided with slip-on latex protectors for the prevention of Voltage Destruction. (PILL packaged devices do not require protection).

SILICON PACKAGING

Low cost silicon DIP packaging is implemented and reliability is assured by the use of a non-hermetic sealing technique which prevents the entrapment of harmful ions, but which allows the free exchange of friendly ions.

SPECIAL FEATURES

Because of the employment of the Signetics' proprietory Sanderson-Rabbet Channel the 25120 will provide 50% higher speed than you will obtain.

COOLING

The 25120 is easily cooled by employment of a six-foot fan, 1/2" from the package. If the device fails, you have exceeded the ratings. In such case, more air is recommended.

BLOCK DIAGRAM

PART IDENTIFICATION

TYPE    "n"    TEMP. RANGE       PACKAGE 
25120    0     0 to -70 grd C    Whatever's Right

[1] "Neu" channel devices enhance or deplete regardless of gate polarity, either simultaneously or randomly. Sometimes not at all.
[2] "S.O.S." copyrighted U.S. Army Commissary 1940.
[3] Not applicable
[4] You can somehow drive these inputs from TTL, the method is obvious.
[5] Measure at 1 MHz, 25mVac, 1,9 pF in series.
[6] For the filaments, what else!
[7] You have a dirty mind. S.E.X. is Signetics EXtra Secret process. "One Shovel Full to One Shovel Full", patented by Yagura, Keshkook, Converso and Al. Circa 1921.
[8] J. Kane calls it design (we humor him).
[9] See "Modern Production Techniques" by T. Arrista (not yet written).
[10] Final until we got a look at some actual parts.
[11] Coffee breaks and lunch hours.
[12] Due credit to EIMAC for inspiration.

TYPICAL CHARACTERISTIC CURVES

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