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 663-2155
製造零件編號SN74HC595DW
TWD16.40
/個 (每包:10個)
單位
SOIC Shift Register 8 HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 10.28 x 7.52 x 2.35mm 10.28mm 7.52mm
RS庫存編號 178-4718
製造零件編號MC14040BDG
TWD13.30
毎管:48 個
單位
SOIC Counter, Divider 12 4000 Surface Mount Binary Up Counter 1 16 3 V 18 V 10 x 4 x 1.5mm 10mm 4mm
RS庫存編號 663-0092
製造零件編號CD74HC165E
TWD12.80
/個 (每包:10個)
單位
PDIP Shift Register 8 HC Through Hole - Serial to Serial/Parallel 1 16 2 V 6 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS庫存編號 709-1974
製造零件編號CD4060BEE4
TWD16.60
/個 (每包:10個)
單位
PDIP Counter, Divider 14 4000 Through Hole Binary 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 756-2836
製造零件編號TC4094BP(N,F)
BrandToshiba
TWD34.20
/個 (每包:5個)
單位
PDIP Shift Register 8 CMOS Through Hole - Serial/Parallel 1 16 3 V 18 V 19.75 x 6.4 x 3.5mm 19.75mm 6.4mm
RS庫存編號 145-0855
製造零件編號CD4021BM
TWD5.80
毎管:40 個
單位
SOIC Shift Register 8 4000 Surface Mount - Serial/Parallel to Serial 1 16 3 V 18 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm
RS庫存編號 739-0136
製造零件編號MM74HC595MX
TWD14.80
/個 (每包:5個)
單位
SOIC Shift Register 8 74HC Surface Mount - Serial/Parallel 1 16 2 V 6 V 10 x 4 x 1.5mm 10mm 4mm
RS庫存編號 178-6992
製造零件編號74HC164D,652
BrandNexperia
TWD6.60
毎管:57 個
單位
SOIC Shift Register 8 HC Surface Mount - Serial to Parallel 1 14 2 V 6 V 8.75 x 4 x 1.45mm 8.75mm 4mm
RS庫存編號 923-6706
製造零件編號CD4060BEE4
TWD7.60
毎管:25 個
單位
PDIP Counter, Divider 14 4000 Through Hole Binary 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 144-9983
製造零件編號SN74HC595DW
TWD9.40
毎管:40 個
單位
SOIC Shift Register 8 HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 10.28 x 7.52 x 2.35mm 10.28mm 7.52mm
RS庫存編號 177-6607
製造零件編號74HC164D,652
BrandNexperia
TWD14.00
單位
SOIC Shift Register 8 HC Surface Mount - Serial to Parallel 1 14 2 V 6 V 8.75 x 4 x 1.45mm 8.75mm 4mm
RS庫存編號 144-9944
製造零件編號CD74HC165E
TWD15.20
毎管:25 個
單位
PDIP Shift Register 8 HC Through Hole - Serial to Serial/Parallel 1 16 2 V 6 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS庫存編號 709-2069
製造零件編號SN74HC4040NE4
TWD15.40
/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 662-9569
製造零件編號CD4021BM
TWD13.40
/個 (每包:10個)
單位
SOIC Shift Register 8 4000 Surface Mount - Serial/Parallel to Serial 1 16 3 V 18 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm
RS庫存編號 464-271
製造零件編號MC14040BDG
TWD13.60
/個 (每包:20個)
單位
SOIC Counter, Divider 12 4000 Surface Mount Binary Up Counter 1 16 3 V 18 V 10 x 4 x 1.5mm 10mm 4mm
RS庫存編號 166-2453
製造零件編號MM74HC595MX
TWD6.50
個 (在毎卷:2500)
單位
SOIC Shift Register 8 74HC Surface Mount - Serial/Parallel 1 16 2 V 6 V 10 x 4 x 1.5mm 10mm 4mm
RS庫存編號 145-0001
製造零件編號SN74HC4040NE4
TWD7.30
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 526-915
製造零件編號SN74HC164D
TWD5.90
/個 (每包:25個)
單位
SOIC Shift Register 8 HC Surface Mount - Serial to Parallel 1 14 2 V 6 V 8.65 x 3.91 x 1.58mm 8.65mm 3.91mm
RS庫存編號 145-4247
製造零件編號MC14517BDWR2G
TWD30.60
個 (在毎卷:1000)
單位
SOIC W Shift Register 64 CMOS Surface Mount - Serial 2 16 -0.5 V +18 V 10.45 x 7.6 x 2.4mm 10.45mm 7.6mm
RS庫存編號 162-6923
製造零件編號CD4060BPWR
TWD4.60
個 (在毎卷:2000)
單位
TSSOP Counter, Divider 14 4000 Surface Mount Binary Up Counter 1 16 3 V 18 V 5 x 4.4 x 1.15mm 5mm 4.4mm