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 145-0892
製造零件編號SN74HC4040PW
HK$3.438
毎管:90 個
單位
TSSOP Counter 12 HC Surface Mount Binary Up Counter 1 16 2 V 6 V 5 x 4.4 x 1.15mm 5mm 4.4mm
RS庫存編號 526-757
製造零件編號SN74HC595D
HK$3.712
毎管:40 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 518-8745
製造零件編號MC14017BDR2G
HK$3.90
單位
SOIC Counter, Divider 5 4000 Surface Mount Decade Up Counter 1 16 3 V 18 V 10 x 4 x 1.5mm 10mm 4mm
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 121-8427
製造零件編號SN74HC595DR
HK$1.43
個 (在毎卷:2500)
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 709-2025
製造零件編號CD4518BEE4
HK$4.039
/個 (每包:10個)
單位
PDIP Counter 4 4000 Through Hole BCD Up Counter 2 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS庫存編號 663-2713
製造零件編號SN74LV165AD
HK$3.204
/個 (每包:10個)
單位
SOIC Shift Register 8 LV Surface Mount - Serial to Serial/Parallel 1 16 2 V 5.5 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm
RS庫存編號 144-9996
製造零件編號CD4518BEE4
HK$2.123
毎管:25 個
單位
PDIP Counter 4 4000 Through Hole BCD Up Counter 2 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS庫存編號 144-9930
製造零件編號CD4021BEE4
HK$1.982
毎管:25 個
單位
PDIP Shift Register 8 4000 Through Hole - Serial/Parallel to Serial 1 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS庫存編號 145-7576
製造零件編號SN74HC590ADW
HK$3.234
毎管:40 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 145-2818
製造零件編號MC74HC595ADG
HK$1.745
毎管:48 個
單位
SOIC Shift Register 8 HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 10 x 4 x 1.5mm 10mm 4mm
RS庫存編號 732-0922
製造零件編號CD74HC4059M96
HK$22.20
單位
SOIC Counter 5 74HC Surface Mount Divide-By-N Down Counter 1 24 2 V 6 V 15.6 x 7.6 x 2.35mm 15.6mm 7.6mm
RS庫存編號 791-8737
製造零件編號74HC393D,652
BrandNexperia
HK$3.223
/個 (每包:19個)
單位
SOIC Counter 4 HC Surface Mount Binary Up Counter 2 14 2 V 6 V 8.75 x 4 x 1.45mm 8.75mm 4mm
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 709-2069
製造零件編號SN74HC4040NE4
HK$3.459
/個 (每包:10個)
單位
PDIP Counter 12 HC Through Hole Binary 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 145-0001
製造零件編號SN74HC4040NE4
HK$2.878
毎管:25 個
單位
PDIP Counter 12 HC Through Hole Binary 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 662-9543
製造零件編號CD4017BM
HK$3.453
/個 (每包:10個)
單位
SOIC Counter, Divider 5 4000 Surface Mount Decade Up Counter 1 16 3 V 18 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm
RS庫存編號 163-2475
製造零件編號MC74HC595ADR2G
HK$1.077
個 (在毎卷:2500)
單位
SOIC Shift Register 8 HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 10 x 4 x 1.5mm 10mm 4mm
RS庫存編號 121-9581
製造零件編號74HC595S16-13
HK$0.922
個 (在毎卷:2500)
單位
SOIC Shift Register 8 HC Surface Mount - Serial to Parallel 1 16 2 V 6 V 10 x 4 x 1.5mm 10mm 4mm
RS庫存編號 162-7429
製造零件編號SN74LV165AD
HK$1.596
毎管:40 個
單位
SOIC Shift Register 8 LV Surface Mount - Serial to Serial/Parallel 1 16 2 V 5.5 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm