SN74LS90N DECADE, DIVIDE-BY-TWELVE AND BINARY COUNTERS crt tv
components
The SN54/74LS90, SN54/74LS92 and SN54/74LS93 are
high-speed 4-bit ripple type counters partitioned into two
sections. Each counter has a divide-by-two section and either a
divide-by-five (LS90), divide-by-six (LS92) or divide-by-eight
(LS93) section which are triggered by a HIGH-to-LOW transition on
the clock inputs. Each section can be used separately or tied
together (Q to CP) to form BCD, bi-quinary, modulo-12, or modulo-16
counters. All of the counters have a 2-input gated Master Reset
(Clear), and the LS90 also has a 2-input gated Master Set (Preset
9).
• Low Power Consumption ...Typically 45 mW
• High Count Rates ...Typically 42 MHz
• Choice of Counting Modes . . . BCD, Bi-Quinary, Divide-by-Twelve,
Binary
• Input Clamp Diodes Limit High Speed Termination Effects
FUNCTIONAL DESCRIPTION
The LS90, LS92, and LS93 are 4-bit ripple type Decade,
Divide-By-Twelve, and Binary Counters respectively. Each device
consists of four master/slave flip-flops which are internally
connected to provide a divide-by-two section and a divide-by-five
(LS90), divide-by-six (LS92), or divide-by-eight (LS93) section.
Each section has a separate clock input which initiates state
changes of the counter on the HIGH-to-LOW clock transition. State
changes of the Q outputs do not occur simultaneously because of
internal ripple delays. Therefore, decoded output signals are
subject to decoding spikes and should not be used for clocks or
strobes. The Q0 output of each device is designed and specified to
drive the rated fan-out plus the CP1 input of the device.
A gated AND asynchronous Master Reset (MR1 • MR2) is provided on
all counters which overrides and clocks and resets (clears) all the
flip-flops. A gated AND asynchronous Master Set (MS1 • MS2) is
provided on the LS90 which overrides the clocks and the MR inputs
and sets the outputs to nine (HLLH).
STOCK LIST
TC75S51F | 10382 | TOSHIBA | 12+ | SOT23-5 |
REF3020AIDBZR | 9492 | TI | 14+ | SOT23-3 |
REF3033AIDBZR | 24088 | TI | 14+ | SOT23-3 |
REF3112AIDBZR | 27096 | TI | 16+ | SOT23-3 |
REF3325AIDBZR | 6294 | TI | 13+ | SOT23-3 |
REF3330AIDBZR | 9074 | TI | 16+ | SOT23-3 |
TL431AIDBZR | 24500 | TI | 14+ | SOT23-3 |
TL431IDBZR | 7000 | TI | 16+ | SOT23-3 |
TL432AIDBZR | 21000 | TI | 16+ | SOT23-3 |
TLV431AIDBZR | 33500 | TI | 14+ | SOT23-3 |
TPS3809I50DBVR | 4680 | TI | 15+ | SOT23-3 |
TPS3809K33DBVR | 16754 | TI | 14+ | SOT23-3 |
SI2303BDS | 150000 | VISHAY | 16+ | SOT23-3 |
SI2308DS-T1-E3 | 9266 | VISHAY | 16+ | SOT23-3 |
SI2309CDS-T1-GE3 | 18032 | VISHAY | 16+ | SOT23-3 |
SI2309DS | 61000 | VISHAY | 14+ | SOT23-3 |
SI2333CDS-T1-E3 | 19500 | VISHAY | 15+ | SOT23-3 |
SMBTA42 | 51000 | VISHAY | 16+ | SOT23-3 |
SPN3406S23RG | 29000 | SYNCPOWER | 08+ | SOT-23 |
REF3012AIDBZR | 43968 | TI | 16+ | SOT-23 |
REF3125AIDBZR | 30708 | TI | 16+ | SOT-23 |
REF3318AIDBZR | 6901 | TI | 16+ | SOT-23 |
SN74AHC1G32DBVR | 90000 | TI | 13+ | SOT-23 |
TL431A | 67200 | TI | 15+ | SOT-23 |
TL431CDBZR | 18392 | TI | 14+ | SOT-23 |
TL432 | 6000 | TI | 13+ | SOT-23 |
TLVH431BQDBZR | 13892 | TI | 14+ | SOT-23 |
TPS560200DBVR | 6544 | TI | 15+ | SOT-23 |
TPS76318DBVR | 11768 | TI | 15+ | SOT-23 |
UT2305G-AE3 | 63000 | UTC | 16+ | SOT-23 |
SI2302ADS-T1-E3 | 12000 | VISHAY | 16+ | SOT-23 |
SI2302DS-T1-E3 | 17000 | VISHAY | 16+ | SOT-23 |
SI2308DS-T1 | 16500 | VISHAY | 16+ | SOT-23 |
SI2309CDS | 14612 | VISHAY | 14+ | SOT-23 |
SI2318CDS-T1-GE3 | 18050 | VISHAY | 16+ | SOT-23 |
SI2319CDS-T1-E3 | 19000 | VISHAY | 14+ | SOT-23 |
SI2319CDS-T1-GE3 | 11318 | VISHAY | 14+ | SOT-23 |
SI2319DS-T1-E3 | 7574 | VISHAY | 16+ | SOT-23 |
SI2333DS | 11354 | VISHAY | 15+ | SOT-23 |
SI2333DS-T1-E3 | 12578 | VISHAY | 13+ | SOT-23 |
SI2342DS-T1-GE3 | 60000 | VISHAY | 16+ | SOT-23 |
SS361CT | 18228 | VISHAY | 16+ | SOT-23 |
SST113-T1 | 11390 | VISHAY | 16+ | SOT-23 |
TN0201K-T1-E3 | 11462 | VISHAY | 16+ | SOT-23 |
TP0610T-T1 | 14000 | VISHAY | 16+ | SOT-23 |
WSH41FC | 12634 | WINSON | 16+ | SOT-23 |
REF2925AIDBZR | 18696 | TI | 16+ | SOT-23 |
REF3025AIDBZR | 23804 | TI | 15+ | SOT-23 |
REF3030AIDBIR | 12080 | TI | 16+ | SOT-23 |
REF3030AIDBZR | 26360 | TI | 14+ | SOT-23 |
REF3040AIDBZR | 13296 | TI | 14+ | SOT-23 |
REF3120AIDBZR | 7048 | TI | 15+ | SOT-23 |
SN65LVDS1DBVR | 10900 | TI | 16+ | SOT-23 |
SN74LVC1G00DBVR | 51000 | TI | 16+ | SOT-23 |
SN74LVC1G06DBVR | 54000 | TI | 16+ | SOT-23 |
SN74LVC1G11DBVR | 12500 | TI | 13+ | SOT-23 |
SN74LVC1G17DBVR | 132000 | TI | 15+ | SOT-23 |
SN74LVC2G14DBVR | 16628 | TI | 16+ | SOT-23 |
TL431ACDBZR | 42500 | TI | 16+ | SOT-23 |
TL431AQDBZR | 7838 | TI | 16+ | SOT-23 |
TL431ASA-7 | 59000 | TI | 16+ | SOT-23 |
TL431BIDBZR | 13856 | TI | 16+ | SOT-23 |
TMP100NA | 26424 | TI | 16+ | SOT-23 |
TPS563209DDCR | 19856 | TI | 15+ | SOT-23 |
TPS61040DBVR | 16638 | TI | 16+ | SOT-23 |
TC7S08F | 16808 | TOSHIBA | 16+ | SOT-23 |
SI2302CDS | 15000 | VISHAY | 14+ | SOT-23 |
SI2305ADS-T1-E3 | 14144 | VISHAY | 15+ | SOT-23 |
SI2308BDS-T1-E3 | 16970 | VISHAY | 15+ | SOT-23 |
SI2309DS-T1-E3 | 18000 | VISHAY | 13+ | SOT-23 |
SI2312BDS-T1-E3 | 60500 | VISHAY | 13+ | SOT-23 |
SI2316DS-T1-E3 | 18500 | VISHAY | 16+ | SOT-23 |
SI2318DS-T1-E3 | 52500 | VISHAY | 16+ | SOT-23 |
SI2323DS-T1-E3 | 11336 | VISHAY | 16+ | SOT-23 |
TN0200K-T1-E3 | 60000 | VISHAY | 16+ | SOT-23 |
TP0101K-T1-E3 | 9446 | VISHAY | 16+ | SOT-23 |