Counter ICs

A Shift Register is a sequential logic device made up of a cascade of flip-flops, through which a sequence of bits are ’shifted’. These devices are commonly used to convert between serial and parallel interfaces.

How it works – basic example

In a Shift Register the output of each flip-flop is connected to the input of the next flip-flop in the cascade. With each cycle of the connected clock, the bits are ’shifted’ down the cascade by one flip-flop.

A simple analogy to understand the basic theory or operation would be to consider a glass tube with an opening both ends, and placing a ball marked ’0’ or ’1’ into one end of the tube at a regular intervals.

As each ball is placed into the tube, all the balls are ’shifted’ along by one position. The sequence in which the balls marked ’0’ and ’1’ where fed in is preserved. Also each time one ball is fed in, the ball that has been in the cascade the longest drops out. So if the tube can contain 4 balls at any one time, this could be described as a 4-bit Shift Register.

Common Types of Shift Register

• Serial-in serial-out (SISO) – In this type of Shift Register, the data input and output is serial. With each clock cycle a new bit is fed into the cascade, with the bit furthest along the cascade exiting as an output. So in a 4-bit register, the output trails the input by 4 clock cycles. This matches the simple example above, with the ball that exits the tube being the output.

• Serial-in parallel-out (SIPO) – In this configuration data is converted from serial into parallel format. As described for the SISO variant above, data is fed in serially and shifted down the cascade, the difference is that each flip-flop has an output, allowing the entire bit array to be output simultaneously as a parallel output. This may be done using a latched of buffered output.

• Parallel-in serial-out (PISO) – This variant takes a parallel input and converts into a serial output. To do this the shift register must implement a write/shift sequence. The parallel data input is (written) into each flip-flop of the array simultaneously in one clock cycle, then for the next cycles the register goes into shift mode as the bits are shifted down the flip-flop cascade, being output as serial data. The process then repeats.

• Parallel-in parallel-out (PIPO) – This type of register differs slightly from the others in that inputs and outputs of each flip-flop in the array are not interconnected. Each flip-flop takes one bit of the parallel input, stores it for a cycle, and then outputs the data simultaneously with the other flip-flops in the register, creating a parallel output that matches the input. Like the SISO type above, PIPO variants can be used to temporarily store data, or act a time delay device.

• Universal Shift Register – A configurable Shift Register that can be programmed to act as a SISO, SIPO, PISO or PIPO device, often on the fly.

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Description Price Package Type Logic Function Number of Stages Logic Family Mounting Type Counter Type Operation Mode Number of Elements Pin Count Minimum Operating Supply Voltage Maximum Operating Supply Voltage Dimensions Length Width
RS庫存編號 333-2978
製造零件編號SN74HC165N
HK$2.973
毎管:25 個
單位
PDIP Shift Register 8 HC Through Hole - Parallel to Serial Converter 1 16 2 V 6 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS庫存編號 663-2149
製造零件編號SN74HC590ADW
HK$5.288
/個 (每包:5個)
單位
SOIC Counter 8 HC Surface Mount Binary Up Counter 1 16 2 V 6 V 10.28 x 7.52 x 2.35mm 10.28mm 7.52mm
RS庫存編號 662-9528
製造零件編號CD40110BE
HK$11.072
/個 (每包:5個)
單位
PDIP Counter 5 4000 Through Hole Decade Down Counter, Up Counter 1 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS庫存編號 145-1222
製造零件編號CD40192BE
HK$3.059
毎管:25 個
單位
PDIP Counter 4 4000 Through Hole Decade Down Counter, Up Counter 1 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS庫存編號 526-640
製造零件編號SN74HC165DR
HK$2.275
/個 (每包:25個)
單位
SOIC Shift Register 8 HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm
RS庫存編號 166-0098
製造零件編號74HC595BQ,115
BrandNexperia
HK$0.973
個 (在毎卷:3000)
單位
VQFN Shift Register 8 HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 3.6 x 2.6 x 0.95mm 3.6mm 2.6mm
RS庫存編號 162-9976
製造零件編號MC100EP142MNG
HK$179.334
毎管:74 個
單位
QFN Shift Register 9 ECL Surface Mount - Serial/Parallel to Serial/Parallel 1 32 3 V 5.5 V 5 x 5 x 0.95mm 5mm 5mm
RS庫存編號 145-7566
製造零件編號CD74HC299M96
HK$3.007
個 (在毎卷:2000)
單位
SOIC Shift Register 8 HC Surface Mount - Serial/Parallel to Serial/Parallel 1 20 2 V 6 V 12.8 x 7.52 x 2.35mm 12.8mm 7.52mm
RS庫存編號 333-3022
製造零件編號SN74HC191N
HK$3.424
毎管:25 個
單位
PDIP Counter 4 HC Through Hole Binary Down Counter, Up Counter 1 16 2 V 6 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS庫存編號 146-2098
製造零件編號74VHC164MTCX
HK$0.987
個 (在毎卷:2500)
單位
SOP Shift Register 8 VHC Surface Mount - Serial to Parallel 1 14 2 V 5.5 V 10.2 x 5.3 x 1.8mm 10.2mm 5.3mm
RS庫存編號 663-0332
製造零件編號CD74HC4040M
HK$5.39
/個 (每包:5個)
單位
SOIC Counter 12 HC Surface Mount Binary Up Counter 1 16 2 V 6 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm
RS庫存編號 806-3315
製造零件編號MC14557BDWG
HK$7.706
/個 (每包:10個)
單位
SOIC W Shift Register 64 CMOS Surface Mount - Serial 1 16 -0.5 V 18 V 10.45 x 7.6 x 2.4mm 10.45mm 7.6mm
RS庫存編號 170-7970
製造零件編號74HC4094D,653
BrandNexperia
HK$1.215
個 (在毎卷:2500)
單位
SO - 8 74HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 10 x 4 x 1.45mm 10mm 4mm
RS庫存編號 169-7239
製造零件編號74HC595T16-13
HK$0.709
個 (在毎卷:2500)
單位
TSSOP Shift Register 8 HC Surface Mount - Serial to Parallel 1 16 2 V 6 V 5.1 x 4.5 x 0.93mm 5.1mm 4.5mm
RS庫存編號 145-6878
製造零件編號SN74ALS193AN
HK$18.013
毎管:25 個
單位
PDIP Counter 4 ALS Through Hole Binary Down Counter, Up Counter 1 16 4.5 V 5.5 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS庫存編號 809-5936
製造零件編號SN74LV8153PW
HK$16.476
/個 (每包:5個)
單位
TSSOP - 8 74LV Surface Mount - Serial to Parallel 1 20 3 V 13.2 V 6.6 x 4.5 x 1.05mm 6.6mm 6.6mm
RS庫存編號 145-0026
製造零件編號CD74HCT166EE4
HK$2.485
毎管:25 個
單位
PDIP Shift Register 8 HCT Through Hole - Serial to Serial/Parallel 1 16 4.5 V 5.5 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS庫存編號 368-7874
製造零件編號HEF4094BT,652
BrandNexperia
HK$5.27
毎管:50 個
單位
SOIC Shift Register 8 4000 Surface Mount - Serial to Serial/Parallel 1 16 3 V 15 V 10 x 4 x 1.45mm 10mm 4mm
RS庫存編號 146-0420
製造零件編號74HCT165PW,112
BrandNexperia
HK$1.135
毎管:96 個
單位
TSSOP Shift Register 8 74HCT Surface Mount - Serial/Parallel to Serial 1 16 4.5 V 5.5 V 5.1 x 4.5 x 0.95mm 5.1mm 4.5mm
RS庫存編號 121-9245
製造零件編號CD4029BEE4
HK$2.271
毎管:25 個
單位
PDIP Counter 4 4000 Through Hole Binary, Decade Down Counter, Up Counter 1 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm